Why we use write form,open form,close form,in script

Question

urgent

Answer 1

Hi,
OPEN_FORM
The function module OPEN_FORM opens form printing. You must call this function module before you can use any other form function (WRITE_FORM, START_FORM, CONTROL_FORM...).
You need not specify a form name. If you omit the name, you must use the function module START_FORM to open a form before starting the output.
You must end form printing by using the function module CLOSE_FORM. Otherwise, the system does not print or display anything.
Within a program, you can use several OPEN_FORM.. CLOSE_FORM pairs. This allows you to write output to several different spool requests from within one program.
START_FORM
In-between the function modules OPEN_FORM and CLOSE_FORM, you can use different forms. This allows you to combine several different forms into one print output. However, you can combine only those forms that have the same page format.
To switch forms, use the function module START_FORM. If another form is still open, you must close it first using END_FORM.
If you specify no form name when calling START_FORM, the system restarts the last open form. If after OPEN_FORM no form was activated yet, the system leaves the function module with the exception UNUSED.
OPEN_FORM->
To initialize the printing of forms via the Raw Data Interface, use function modules (OPEN_FORM und CLOSE_FORM) and a flag in the form (administration data). For this purpose, the function modules include the additional optional import parameter RAW_DATA_INTERFACE.
http://help.sap.com/saphelp_nw04s/helpdata/en/d2/cb3d8e455611d189710000e8322d00/content.htm
START_FORM->
In-between the function modules OPEN_FORM and CLOSE_FORM, you can use different forms. This allows you to combine several different forms into one print output. However, you can combine only those forms that have the same page format.
To switch forms, use the function module START_FORM. If another form is still open, you must close it first using END_FORM.
If you specify no form name when calling START_FORM, the system restarts the last open form. If after OPEN_FORM no form was activated yet, the system leaves the function module with the exception UNUSED.
from: http://help.sap.com/saphelp_nw2004s/helpdata/en/d6/0dba1a494511d182b70000e829fbfe/frameset
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Cheers,
Chandra Sekhar.