What is the difference between hidden field and view state??

Both view state and hidden field are use to store page specific information then, what is the difference between both of them??

The ViewState of a page is actually stored in a large hidden field and it contains information about the entire page whereas a single hidden field that you define yourself is used to store some single value that should not be displayed.
Please refer to the following page for more information about ASP.NET View State:
http://msdn.microsoft.com/en-us/library/ms972976.aspx
But please post your ASP.NET and web related questions at
http://forums.asp.net in the future.
Also, please remember to mark any helpful posts as answer.

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What's the difference between MacBook Pro with flash storage and MacBook Pro with solid state drive?

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What's the difference between segment filtering and reduced message type

Hi gurus,
What's the difference between segment filtering and reduced message type? It seems they have the same functionality: Reduce the segment while idoc is generated.
Thanks in advance.

Hi,
BD53 is for IDoc Reduction.
this allows you to create a reduced message based upon a standard message type.If you want see mandatory fields. go to T-coe BD53 and give one standard messege type name and eg: matmas
there mandatory fields will be in Green color..
And BD56- This transaction is used to filter out segments of IDocs for combination of sender and receiver. This is usefull in scenarios where a standard IDoc with many segments is used but the receiving partner is only interested in some of the segments
the table related to this transation is TBD20
please go through below blog you have an idea abt that,
http://wiki.sdn.sap.com/wiki/display/ABAP/ReducedMessageTypes
http://saptotal.com/IDoc%20Segment%20Filtering.html
regards,
ganesh.

What is the difference between (SEPA Structured) and (SEPA Unstructured)?

Hi,
Could you please teach me about "Format Payments (SEPA Structured)"
and "Format Payments (SEPA Unstructured)"?
1.What is Format Payments (SEPA Structured)?
Is (SEPA Structured) used with which case?
2.What is Format Payments (SEPA Unstructured)?
Is (SEPA Unstructured) used with which case?
3.What is the difference between (SEPA Structured) and (SEPA Unstructured)?
The customer is checking Note.791226.1.
However, he says that he cannot understand these two differences.
Please teach me.
Thanks.

From the European Payments Council website:
Remittance information: structure the unstructured
The SEPA Credit Transfer Scheme permits the end-to-end carrying of remittance data on a structured or unstructured basis appropriate to the nature of the payment (the remittance information usually contains details of the contract underlying the transaction such as an invoice number, for example). The length of the remittance information in the SCT Scheme is fixed at a standard length of 140 characters and banks are obliged to pass on the full remittance information.
The EPC supports a proposal developed by the European Association of Corporate Treasurers (EACT), which allows companies to agree on a structure for the remittance information. The EACT suggestion on how to structure the "unstructured" remittance fields allows companies exchanging a credit transfer to agree, among other, on information to be transmitted in a specific manner. Banks will carry remittance information structured in such an agreed way unaltered throughout the process chain.

What is the difference between interactive report and alv interactive repor

what is the difference between interactive report and alv interactive report
could u plz explain clearly.

Hi Rajesh,
interactive report or alv interactive report , both are same but except the viewer, Abap List Viewer (ALV).
Here in i am placing a sample simple ALV Interactive report.
Just double click on the customer number to go to the next screen.
*& Report ZKAL_ALV_INTERACTIVE_1                                      *
REPORT ZKAL_ALV_INTERACTIVE_1                  .
TYPE-POOLS: SLIS.
TYPES: BEGIN OF TY_KNA1,
          KUNNR TYPE KUNNR,
          NAME1 TYPE NAME1,
          ORT01 TYPE ORT01,
        END OF TY_KNA1.
TYPES: BEGIN OF TY_VBAK,
          VBELN TYPE VBELN,
          ERNAM TYPE ERNAM,
          ERDAT TYPE ERDAT,
          NETWR TYPE NETWR,
          WAERK TYPE WAERK,
         END OF TY_VBAK.
&--WORK AREA & TABLE DECLARATION--
DATA: W_KNA1 TYPE TY_KNA1.
DATA: T_KNA1 TYPE STANDARD TABLE OF TY_KNA1 INITIAL SIZE 1.
DATA: W_VBAK TYPE TY_VBAK.
DATA: T_VBAK TYPE STANDARD TABLE OF TY_VBAK INITIAL SIZE 1.
&--FIELDCAT TABLE & WORK AREA--
DATA: W_FCAT TYPE SLIS_FIELDCAT_ALV.
DATA: T_FCAT TYPE SLIS_T_FIELDCAT_ALV.
DATA: W_FCAT1 TYPE SLIS_FIELDCAT_ALV.
DATA: T_FCAT1 TYPE SLIS_T_FIELDCAT_ALV.
&--EVENT TABLE AND WORK AREA--
DATA: W_EVENTS TYPE SLIS_ALV_EVENT.
DATA: T_EVENTS TYPE SLIS_T_EVENT.
DATA: W_EVENTS1 TYPE SLIS_ALV_EVENT.
DATA: T_EVENTS1 TYPE SLIS_T_EVENT.
&--COMMENT TABLE & WORK AREA--
DATA: W_COMMENT TYPE SLIS_LISTHEADER.
DATA: T_COMMENT TYPE SLIS_T_LISTHEADER.
DATA: W_COMMENT1 TYPE SLIS_LISTHEADER.
DATA: T_COMMENT1 TYPE SLIS_T_LISTHEADER.
&----APPENDING FCAT -
W_FCAT-COL_POS = 1.
W_FCAT-FIELDNAME = 'KUNNR'.
W_FCAT-SELTEXT_M = 'CUST. NO'.
W_FCAT-HOTSPOT = 'X'.            "HOT SPOT HAND SYMBOL
W_FCAT-EMPHASIZE = 'C119'.       "FOR COLORING THE COLUMN 1
APPEND W_FCAT TO T_FCAT.
CLEAR W_FCAT.
W_FCAT-COL_POS = 2.
W_FCAT-FIELDNAME = 'NAME1'.
W_FCAT-SELTEXT_M = 'CUST. NAME'.
APPEND W_FCAT TO T_FCAT.
W_FCAT-COL_POS = 3.
W_FCAT-FIELDNAME = 'ORT01'.
W_FCAT-SELTEXT_M = 'CITY'.
APPEND W_FCAT TO T_FCAT.
W_FCAT1-COL_POS = 1.
W_FCAT1-FIELDNAME = 'VBELN'.
W_FCAT1-SELTEXT_M = 'ORDER NO'.
W_FCAT1-EMPHASIZE = 'C519'.
APPEND W_FCAT1 TO T_FCAT1.
CLEAR W_FCAT.
W_FCAT1-COL_POS = 2.
W_FCAT1-FIELDNAME = 'ERNAM'.
W_FCAT1-SELTEXT_M = 'NAME OF PARTY'.
APPEND W_FCAT1 TO T_FCAT1.
W_FCAT1-COL_POS = 3.
W_FCAT1-FIELDNAME = 'ERDAT'.
W_FCAT1-SELTEXT_M = 'DATE'.
APPEND W_FCAT1 TO T_FCAT1.
W_FCAT1-COL_POS = 4.
W_FCAT1-FIELDNAME = 'NETWR'.
W_FCAT1-SELTEXT_M = 'ORDER VALUE'.
APPEND W_FCAT1 TO T_FCAT1.
W_FCAT1-COL_POS = 5.
W_FCAT1-FIELDNAME = 'WAERK'.
W_FCAT1-SELTEXT_M = 'CURRENCY'.
APPEND W_FCAT1 TO T_FCAT1.
&--APPEND COMMENTRY--
W_COMMENT-TYP = 'H'.
W_COMMENT-INFO = 'CUSTOMER DETAILS'.
APPEND W_COMMENT TO T_COMMENT.
CLEAR W_COMMENT.
&--APPEND EVENTS TABLE--
W_EVENTS-NAME = 'TOP_OF_PAGE'.
W_EVENTS-FORM = 'TOPPAGE'.
APPEND W_EVENTS TO T_EVENTS.
W_EVENTS-NAME = 'USER_COMMAND'.
W_EVENTS-FORM = 'SUB2'.
APPEND W_EVENTS TO T_EVENTS.
W_EVENTS1-NAME = 'TOP_OF_PAGE'.
W_EVENTS1-FORM = 'TOPPAGE1'.
APPEND W_EVENTS1 TO T_EVENTS1.
CLEAR W_EVENTS1.
W_EVENTS1-NAME = 'USER_COMMAND'.
W_EVENTS1-FORM = 'SUB3'.
APPEND W_EVENTS1 TO T_EVENTS1.
SELECT-OPTIONS: CUSTNO FOR W_KNA1-KUNNR.
SELECT KUNNR
         NAME1
         ORT01 FROM KNA1 INTO TABLE T_KNA1
         WHERE KUNNR IN CUSTNO.
CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY'
EXPORTING
   I_CALLBACK_PROGRAM                = 'ZKAL_ALV_INTERACTIVE_12'
   I_BACKGROUND_ID                   = 'BIKE'
   I_GRID_TITLE                      = 'CUSTOMER DETAILS'
   IT_FIELDCAT                       = T_FCAT
   IT_EVENTS                         = T_EVENTS
TABLES
    T_OUTTAB                          = T_KNA1 .
FORM TOPPAGE.
CALL FUNCTION 'REUSE_ALV_COMMENTARY_WRITE'
    EXPORTING
      IT_LIST_COMMENTARY       = T_COMMENT
     I_LOGO                   = 'LOGO_ALV'.
ENDFORM. "END OF TOPPAGE SUB.
FORM SUB2 USING UCOMM LIKE SY-UCOMM FIELDS1 TYPE SLIS_SELFIELD.
READ TABLE T_KNA1 INTO W_KNA1 INDEX FIELDS1-TABINDEX.
SELECT VBELN
         ERNAM
         ERDAT
         NETWR
         WAERK
               FROM VBAK
               INTO TABLE T_VBAK
               WHERE KUNNR = W_KNA1-KUNNR.
CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY'
EXPORTING
   I_CALLBACK_PROGRAM                = 'ZKAL_ALV_INTERACTIVE_12'
   I_BACKGROUND_ID                   = 'KALEEM'
   I_GRID_TITLE                      = 'LIST OF ORDERS'
   IT_FIELDCAT                       = T_FCAT1
   IT_EVENTS                         = T_EVENTS1
TABLES
    T_OUTTAB                          = T_VBAK.
ENDFORM.    "END OF SUB2.
FORM TOPPAGE1.
&--APPEND COMMENTRYOF SECONDRY SCREEN--
W_COMMENT1-TYP = 'H'.
W_COMMENT1-INFO = 'LIST OF ORDERS'.
APPEND W_COMMENT1 TO T_COMMENT1.
W_COMMENT1-TYP = 'S'.
W_COMMENT1-KEY = 'CUSTOMER'.
W_COMMENT1-INFO = W_KNA1-KUNNR.
APPEND W_COMMENT1 TO T_COMMENT1.
CLEAR W_COMMENT.
W_COMMENT1-TYP = 'A'.
W_COMMENT1-INFO = W_KNA1-NAME1.
APPEND W_COMMENT1 TO T_COMMENT1.
CLEAR W_COMMENT1.
CALL FUNCTION 'REUSE_ALV_COMMENTARY_WRITE'
    EXPORTING
      IT_LIST_COMMENTARY       = T_COMMENT1
     I_LOGO                   = 'LOGO_ALV'
REFRESH T_COMMENT1.
ENDFORM.    "END OF TOPPAGE1
FORM SUB3 USING UCOMM LIKE SY-UCOMM FIELDS1 TYPE SLIS_SELFIELD.
    READ TABLE T_VBAK INTO W_VBAK INDEX FIELDS1-TABINDEX.
SET PARAMETER ID 'AUN' FIELD W_VBAK-VBELN.
CALL TRANSACTION 'VA02' AND SKIP FIRST SCREEN.
ENDFORM.
U can also find some of the useful codes on WIKI-SDN.
Reward helpful Answers.
Regds,
Kaleem.

What is the difference between smart forms and scripts.?

what is the difference between smart forms and scripts.?

Differences between Smartforms and SAPscript
a) Multiple page formats are possible in smartforms which is not the case in SAPScripts
b) It is possible to have a smartform without a main window .
c) Routines can be written in smartforms tool.
d) Smartforms generates a function module when activated.
e) Smartforms can create web enable forms like XML
f) smartforms itself contine subroutine pools need not to main separetly like in case of scripts
Request you to refer the following links
www.sap-img.com/smartforms/smartform-sapscripts.htm
www.erpgenie.com/abap/smartforms_sapscript.htm
Sapscript vs Smartforms
Difference with SMARTFORMS vs. SapScript(SE71)
The Following are the differences :-
a) Multiple page formats are possible in smartforms which is not the case in SAPScripts
b) It is possible to have a smartform without a main window .
c) Labels cannot be created in smartforms.
d) Routines can be written in smartforms tool.
e) Smartforms generates a function module when activated
Scripts are client dependent whereas smartforms aren't.
Upto 99 main windows are possible in scripts and only one in smarforms.
To create multiple main windows in scripts, you just have to give the window type as MAIN whnever you create a window.
Scripts still exists but smartforms are in use from 4.6c version, now the lastest version of these two is adobe forms
SAP Smart Forms is introduced in SAP Basis Release 4.6C as the tool for creating and maintaining forms.SAP Smart Forms allow you to execute simple modifications to the form and in the form logic by using simple graphical tools; in 90% of all cases, this won't include any programming effort. Thus, a power user without any programming knowledge can
configure forms with data from an SAP System for the relevant business processes.
Advantages of SAP Smart Forms
SAP Smart Forms have the following advantages:
1. The adaptation of forms is supported to a large extent by graphic tools for layout and logic, so that no programming knowledge is necessary (at least 90% of all adjustments). Therefore, power user forms can also make configurations for your business processes with data from an SAP system. Consultants are only required in special cases.
2. Displaying table structures (dynamic framing of texts)
3. Output of background graphics, for form design in particular the use of templates which were scanned.
4. Colored output of texts
5. User-friendly and integrated Form Painter for the graphical design of forms
6. Graphical Table Painter for drawing tables
7. Reusing Font and paragraph formats in forms (Smart Styles)
8. Data interface in XML format (XML for Smart Forms, in short XSF)
9. Form translation is supported by standard translation tools
10. Flexible reuse of text modules
11. HTML output of forms (Basis release 6.10)
12. Interactive Web forms with input fields, pushbuttons, radio buttons, etc. (Basis-Release 6.10)
Reward Points if useful.

What is the difference between customer exits and user exits?

hello friends,
what is the difference between customer exits and user exits?

Hi
User exit - A user exit is a three character code that instructs the system to access a program during system processing.
SXX: S is for standard exits that are delivered by SAP.   XX represents the 2-digit exit number.
UXX: U is for user exits that are defined by the user. XX represents the 2-digit exit number
Customer exit - The R/3 enhancement concept allows you to add your own functionality to SAPs standard business applications without having to modify the original applications. SAP creates customer exits for specific programs, screens, and menus within standard R/3 applications. These exits do not contain any functionality. Instead, the customer exits act as hooks. You can hang your own add-on functionality onto these hooks.     *-- Mani
The following document is about exits in SAP :-
The R/3 enhancement concept allows you to add your own functionality to SAPs standard business applications without having to modify the original applications.
SAP creates user exits for specific programs, screens, and menus within standard R/3 applications. These exits do not contain any functionality. Instead, the customer exits act as hooks. You can hang your own add-on functionality onto these hooks.
Types of Exits
There are several different types of user exits. Each of these exits acts as hooks where you can attach or "hang" your own add-ons.
Menu Exits
Menu exits add items to the pulldown menus in standard SAP applications. You can use these menu items to call up your own screens or to trigger entire add-on applications.
SAP creates menu exits by defining special menu items in the Menu Painter. These special entries have function codes that begin with "+" (a plus sign). You specify the menu items text when activating the item in an add-on project.
Screen Exits
Screen exits add fields to screens in R/3 applications. SAP creates screen exits by placing special subscreen areas on a standard R/3 screen and calling a customer subscreen from the standard screens flow logic.
Function Module Exits
Function module exits add functions to R/3 applications. Function module exits play a role in both menu and screen exits.
When you add a new menu item to a standard pull down menu, you use a function module exit to define the actions that should take place once your menu is activated.
Function module exits also control the data flow between standard programs and screen exit fields. SAP application developers create function module exits by writing calls to customer functions into the source code of standard R/3 programs.
These calls have the following syntax:
CALL CUSTOMER-FUNCTION 001.
Field Exits
Field exits allow you to create your own programming logic for any data element in the Dictionary. You can use this logic to carry out checks, conversions, or business-related processing for any screen field. Example: The data element BBBNR identifies a companys international location number. You might want to set up your R/3 System so that all international location numbers are larger than 100.
The field exit concept lets you create a special function module that contains this logic.
You assign the special function module to the data element BBBNR. You then assign the module to any programs and screens in which users can add new international location numbers. When you activate your field exit, the system automatically triggers your special routine whenever a user enters a company location number.
In 4.6c, you can use "RSMODPRF" program to create field exits.
An example of a user exits :-
MODULE user_exit_0001 INPUT
    CASE okcode.
        WHEN 'BACK OR EXIT'.
            CASE sy-dynnr.
                    WHEN '100'.
                         SET SCREEN 0.
                         LEAVE SCREEN.
                    WHEN '200'.
                         SET SCREEN 100.
                         LEAVE SCREEN.
             ENDCASE.
      ENDCASE.

What is the differences between Transparent,Pooled and Cluster tables?

Hello all,
What is Pool table?What is the differences between Transparent,Pooled and Cluster tables?
Regards!
Purna

Transparent table:
Tables can be defined independently of the database in the ABAP Dictionary. The fields of the table are defined together with their (database-independent) data types and lengths.
A table definition in the ABAP Dictionary has the following components:
Table fields: The field names and the data types of the fields contained in the table are defined here.
Foreign keys: The foreign keys define the relationships between this table and other tables.
Technical settings: The technical settings define how the table is created on the database.
Indexes: Indexes can be defined for the table to speed up data selection from the table.
There are three categories of database tables in the ABAP Dictionary.
A physical table definition is created in the database for the table definition stored in the ABAP Dictionary for transparent tables when the table is activated. The table definition is translated from the ABAP Dictionary to a definition of the particular database.
On the other hand, pooled tables and cluster tables are not created in the database. The data of these tables is stored in the corresponding table pool or table cluster. It is not necessary to create indexes and technical settings for pooled and cluster tables.
Pooled table
Pooled tables can be used to store control data (e.g. screen sequences, program parameters or temporary data). Several pooled tables can be combined to form a table pool. The table pool corresponds to a physical table on the database in which all the records of the allocated pooled tables are stored.
Cluster table
Cluster tables contain continuous text, for example, documentation. Several cluster tables can be combined to form a table cluster. Several logical lines of different tables are combined to form a physical record in this table type. This permits object-by-object storage or object-by-object access. In order to combine tables in clusters, at least parts of the keys must agree. Several cluster tables are stored in one corresponding table on the database.
Regds,
Manohar

What is the difference between Topic Keywords and Index File Keywords?

What is the difference between Topic Keywords and Index File Keywords? Any advantages to using one over the other? Do they appear differently in the generated index?
RH9.0.2.271
I'm using Webhelp

Hi there
When you create a RoboHelp project you end up with many different ancillary files that are used to store different bits of information. Many of these files bear the name you assigned to the project at the time you created it. The index file has the project name and it ends with a .HHK file extension. (HHK meaning HTML Help Keywords)
Generally, unless you change RoboHelp's settings, you add keywords to this file and associate topics to the keywords via the Index pod. At the time you compile a CHM or generate other types of output, the file is consulted and the index is built.
As I said earlier, the default is to add keywords to the Index file until you configure RoboHelp to add the keywords to the topics themselves. Once you change this, any keyword added will become a META tag in the topic code. If your keyword is BOFFO, the META tag would look like this:
<meta name="MS-HKWD" content="BOFFO" />
When the help is compiled or generated, the Index (.HHK) file is consulted as normal, but any topics containing keywords added in this manner are also added to the Index you end up with. From the appearance perspective, the end user woudn't know the difference or be able to tell. Heck, if all you ever did was interact with the Index pod, you, as an author wouldn't know either. Well, other than the fact that the icons appear differently.
Operationally, keywords added to the topics themselves may hold an advantage in that if you were to import these topics into other projects, the Index keywords would already be present.
Hopefully this helps... Rick

What is the difference between Video-out and mirroring?

What is the difference between Video-out and mirroring? I can't get iPhone 4 video to work on my TV screen
I have just bought an MD098ZM/A (Apple 30-pin Digital AV Adapter). I am struggling to get it to show a picture on my TV. I know I'm doing something right because the audio is coming out of my TV speakers but no picture on the TV screen.
I have used the same HDMI channel (on the TV side) with the same cable and my thunderbolt port (MacBook Air) without any trouble - and on the same app (BBC iPlayer download then full-screen mode).
Now I note that the packaging for the MD098ZM/A says video-out on iPhone 4 but mirroring only on iPhone 4S. I only have an iPhone 4 (not the 4S). Now if the lack of iPhone 4 support for mirroring means that I can't play video material out to my TV, then in what sense is there any video-out capability at all?
There is only safety and warranty paperwork in the Apple adapter packaging - no help information. And I haven't found further guidance online either.
I do note somewhere online that it suggests that basic non-mirroring video-out (for this adapter) only works with some external TV sets. Any way of finding out which? I'm using a Sanyo CE32LD90-B LCD TV if it helps.
So far not doing very well.

Now found these but have had to give up on this adapter!
http://manuals.info.apple.com/en_US/iphone_user_guide.pdf
http://support.apple.com/kb/HT4108

What is the difference between jsp :include and server side include

what is the difference between jsp :include and server side include(request dispatcher include method)????
i understand that both request dispatcher include method and jsp:include take dynamic data,so when would one use request dispatcher include and when jsp:include.
Is the usage interchangeable?i believe jsp include is used only for jsp/html but include directive can be used to include servlets ,jsp and html....correct me if i m wrong and
do suggest if u hav ny other diff in this context...

The difference really is: in what format do you want your inclusions? If your environment has many Java developers and only a few designers that focus mainly on, say, Flash, that might push you more towards the server-side include() directive. Or, if you have a large set of pages that receive dynamic content that is displayed in a consistent fashion (such as a workflow header area on a page).
If, on the other hand, you have more web designers, there may be a greater desire to deal in markup rather than Java code. Java developers themselves might prefer to view markup (JSP) that more resembles the eventual output than something occuring in Java code.
Finally, there are considerations of tiering. While it is totally possible to (and I have previously) implement 'view classes' that render markup or generate layout templates, JSP's offer, IMO, a subtle, psychological advantage. By forcing a developer to work in a different format, markup versus Java source, the separation on view from controller and model becomes a bit easier. It is still possible to make mistakes, but if a developer at some point notices, "Wait, I'm in a JSP, should I be importing a java.sql class?", then the choice to use JSP includes has paid off in spades.
- Saish

What is the difference between Session timeout and Short Session timeout Under Excel Service Application -- session management?

Under Excel Service Application --> session management; what is the difference between Session timeout and Short Session timeout?

Any call made from the API will automatically be set to the “Session Timeout” period, no matter
what. Calls made from EWA (Excel Web Access) will get the “Short Session Timeout” period assigned to it initially.
Short Session Timeout and Session Timeout in Excel Services
Short Session Timeout and Session Timeout in Excel Services - Part 2
Sessions and session time-outs in Excel Services
above links are from old version but still applies to all.
Please remember to mark your question as answered &Vote helpful,if this solves/helps your problem. ****************************************************************************************** Thanks -WS MCITP(SharePoint 2010, 2013) Blog: http://wscheema.com/blog

What are the differences between ECC5.0 and 6.0 new GL functionality

Hi Experts,
What are the differences between ECC5.0 and 6.0 new GL functionality.
If we want to implement IFRS, I think New GL functionality is very helpful, but why sap is recommending only for ECC6.0 new GL functionality, Eventhough this functionality is available in ECC5.0.
Best Regards,
Dharani

Dear,
ECC 5.0 vs. ECC 6.0/SAP ERP 6.0
Functionality not available in the new G/L with mySAP ERP 2004 and ERP Central Component (ECC) 5.0:
Transfer prices
Statistical key figures
Euro translation
Audit Information System (AIS)
Archiving
Data retention tool
Regards,
Chintan Joshi.

What is the difference between document class and normal class

Hi,
Please let me know what is the difference between document class and normal class.
And I have no idea which class should call as document class or call as an object.
Thanks
-Actionscript Developer

the document class is invoked immediately when your swf opens. the document class must subclass the sprite or movieclip class.
all other classes are invoked explicitly with code and need not subclass any other class.

In OSX Activity Monitor, what's the difference between 'free' memory and 'inactive' memory

In OS X Activity Monitor, what's the difference between 'free' memory and 'inactive' memory. My daughters 2Gb MacBook Pro is very slow, it probably needs more memory but there is almost 1Gb of 'inactive' memory but no 'free' memory when an application is opened.
Thanks

Free RAM is the one that has not been used by any application since you started up your Mac, and inactive RAM is the one that was used by an application and it is not in use anymore.
1 GB of inactive RAM is a lot, and it may be the cause of the slowness. There are a lot of apps that allows you to turn inactive into free RAM. I use FreeMemory, but have a look at the Mac App Store.
If you are a developer, you can do that with a command you can type into Terminal:
sudo purge

What is the difference between hidden field and view state??

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