Why u can call(r using) ssf_function_module_name in smartforms?

Calling SMARTFORMS from your ABAP program. Collecting all the table data in your program, and pass once or By using &Quot;ssf_function_module_name &Quot; the user can obtain the function mudule generated by the Smartform. The input parameter is the SMARTFORM name the output parameter is the function module generated .It has to be type RS38L_FNAM. After getting the output parameter . CALL FUNCTION(output parameter name). to SMARTFORMS.