What is the usage of START_FORM and OPEN_FORM

Hi,
In sap script,exactly what is the usage of START_FORM,OPEN_FORM,CLOSE_FORM and END_FORM.Could you please help out.
Thanks,
Madhu

Hai Madhu
For START_FORM
SAPscript: Start a form
The layout set can be changed in the current print procedure with START_FORM. It is therefore possible to combine several different layout sets in one printer output. Before a new layout set is opened with START_FORM, an open layout set must be closed with END_FORM.
Parameters
ARCHIVE_INDEX
FORM
LANGUAGE
STARTPAGE
PROGRAM
MAIL_APPL_OBJECT
LANGUAGE
Exceptions
FORM
FORMAT
UNENDED
UNOPENED
UNUSED
SPOOL_ERROR
CODEPAGE
For OPEN_FORM
SAPscript: Open form printing
The module OPEN_FORM opens layout set printing. This function must be called up before you can work with other layout set functions (WRITE_FORM, ...).
It is not obligatory to enter a layout set name to open it. If a layout set is not specified, one must be opened with START_FORM.
For information on DEVICE MAIL see function module SO_NEW_DOCUMENT_SEND_API1
Parameters
APPLICATION
ARCHIVE_INDEX
ARCHIVE_PARAMS
DEVICE
DIALOG
FORM
LANGUAGE
OPTIONS
MAIL_SENDER
MAIL_RECIPIENT
MAIL_APPL_OBJECT
RAW_DATA_INTERFACE
SPONUMIV
LANGUAGE
NEW_ARCHIVE_PARAMS
RESULT
Exceptions
CANCELED
DEVICE
FORM
OPTIONS
UNCLOSED
MAIL_OPTIONS
ARCHIVE_ERROR
INVALID_FAX_NUMBER
MORE_PARAMS_NEEDED_IN_BATCH
SPOOL_ERROR
CODEPAGE
For CLOSE_FORM
SAPscript: End layout set printing
Form printing started with OPEN_FORM is completed. Possible closing operations on the form last opened are carried out.
Form printing must be completed by this function module. If this is not carried out, nothing is printed or displayed on the screen.
Parameters
RESULT
RDI_RESULT
OTFDATA
Exceptions
UNOPENED
BAD_PAGEFORMAT_FOR_PRINT
SEND_ERROR
SPOOL_ERROR
CODEPAGE
For END_FORM
SAPscript: Terminate a form
Closes the current layout set. Final operations required on this layout set are carried out.
CAUTION: END_FORM is not a replacement for CLOSE_FORM.
Parameters
RESULT
Exceptions
UNOPENED
BAD_PAGEFORMAT_FOR_PRINT
SPOOL_ERROR
CODEPAGE
Thanks & regards
Sreenivasulu P

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