What is the difference between Constant Window, Variable Window,Main Window

hello all
what is the difference between 1) Constant Window
2) Variable Window
3) Main Window in SAP SCRIPT

Hi,
Window Types
When defining a form window, you must select a window type for the window.
You can choose between three types:
Constant Windows (CONST)
Variable Windows (VAR)
Main Windows (MAIN)
Constant Windows (CONST)
Starting with Release 4.0, the system internally processes windows of type CONST similar to windows of type VAR.
Therefore, if you create a new window, always use type VAR.
Variable Windows (VAR)
The contents of variable windows is processed again for each page, on which the window appears.
The system outputs only as much text as fits into the window. Text exceeding the window size is truncated;
the system does not trigger a page break. Unlike constant windows, the page windows declared as variable windows may have different sizes on different form pages.
As far as the processing of the window contents is concerned, the system currently treats constant and variable windows alike.
The only difference is that constant windows have the same size throughout the form.
Main Windows (MAIN)
Each form must have one window of type MAIN. Such a window is called the main window of the form.
For SAPscript forms, the main window has a central meaning:
It controls the page break.
It contains the text body that may cover several pages.
It allows to fix text elements at the upper and lower margins of the allocated page window (for example, for column headings).
As soon as a window of type MAIN is full, SAPscript automatically triggers a page break and continues to
output the remaining text in the main window of the subsequent page. Page windows of type MAIN have the same width throughout the form.
The SAPscript composer thus avoids reformatting of the text after each page break.
If a page does not have a main window, the system implicitly processes all other windows of the page and continues with the subsequent page.
This page must not call itself as subsequent page (recursive call), since this would produce an endless loop.
In such a case, SAPscript terminates the output after three subsequent pages.
For printing header lines or totals, the different output areas of the main window are of special importance.
go through this links:
In Scripts Variable window and constant wind difference?
Main Window
Re: Main Window in SAP Script
What is the difference between Constant window and variable window?
Regards
Adil

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Gopal,
pls. look into it.Good explanation on you requirement.
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The data objects <f1> and <f2> are incompatible, and no conversion is possible. The assignment is not possible. If this can be recognized statically, a syntax error occurs. If it is not recognized before the program is run, a runtime error occurs.
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Pls. reward if useful

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Hi,
<b>MOVE</b>
Syntax
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Notes
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Obsolete Form: MOVE PERCENTAGE
Exceptions
Catchable Exceptions
CX_SY_CONVERSION_NO_NUMBER
Cause: Operand cannot be interpreted as number
Runtime Error: CONVT_NO_NUMBER (catchable)
CX_SY_CONVERSION_OVERFLOW
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Runtime Error: BCD_FIELD_OVERFLOW (catchable)
Cause: Operand too large or (intermediate) result too large
Runtime Error: CONVT_OVERFLOW (catchable)
CX_SY_MOVE_CAST_ERROR
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Runtime Error: MOVE_CAST_REF_ONLY
Non-Catchable Exceptions
Cause: Source field (type P) does not contain correct BCD format.
Runtime Error: BCD_BADDATA
Cause: Assignment for deep structures not permitted if these overlap.
Runtime Error: MOVE_COMPLEX_OVERLAP
Cause: Type conflict with the assignment between object references.
Runtime Error: MOVE_INTERFACE_NOT_SUPPORTED,
Runtime Error: MOVE_IREF_NOT_CONVERTIBLE,
Runtime Error: MOVE_IREF_TO_OREF,
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Runtime Error: MOVE_NOT_SUPPORTED
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Runtime Error: MOVE_TO_LIT_NOTALLOWED_NODATA
Cause: During a loop in an internal table, an attempt was made to overwrite a reference variable that is linked with the internal table by REFERENCE INTO.
Runtime Error: MOVE_TO_LOOP_REF
<b>Write</b>
Syntax Diagram
WRITE - TO
Syntax
WRITE {source|(source_name)} TO destination
                             [int_format_options].
Effect:
This statement assigns the formatted content of the data object source, or the formatted content of the data object whose name is contained in source_name, to the data object destination. The data objects source_name and destination must be character type and flat. source_name can contain the name of the data object to be assigned in upper or lower case. If the data object specified in source_name does not exist, the assignment is not executed, and sy-subrc is set to 4.
The statement WRITE TO has the same effect as the statement WRITE for lists. This statement formats the content of source or the source field specified in source_name as described in the field. It does not, however, store the result in an output area of a list in the list buffer, but instead stores it in a variable. The output length is determined by the length of the variable.
The same additions int_format_options can be specified for formatting the content as in the statement WRITE for lists, except for NO-GAP and UNDER.
System fields
sy-subrc Meaning
0 The data object specified in source_name was found and the assignment was executed.
4 The data object specified in source_name was not found and the assignment was not executed.
For the static specification of source, sy-subrc is not set.
Note:
If destination is specified as an untyped field symbol or an untyped formal parameter, and is not flat and character-type when the statement is executed, this leads to an untreatable exception in a Unicode program. In non-Unicode programs, this only leads to an exception for deep types. Flat types are handled as character-type data types.
Example:
After the assignment, the variables date_short and date_long receive the current date in the order specified in the user master record. The variable date_long also contains the defined separators, as the output length is sufficiently long. The content of the variable date_mask is formatted according to the formatting addition DD/MM/YY.
DATA: date_short(8) TYPE c,
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WRITE sy-datum TO: date_short,
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Exceptions
Non-Catchable Exceptions
Cause: Negative length specified for offset/length
Runtime Error: WRITE_TO_LENGTH_NEGATIVE
Cause: Negative offset specified in offset/length
Runtime Error: WRITE_TO_OFFSET_NEGATIVE
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Runtime Error: WRITE_TO_OFFSET_TOOLARGE
Thanks
sunil

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