control parameters for smartform

One of the most important parameters of the generated function module is
control_parameters. The following fields are available:
no_open and no_close: These parameters allow you to add several forms to a spool request. To do this, set the parameters as follows:

•   First call: no_open = space, no_close = "X".
•   Allsubsequent calls: no_open = "X", no_close = "X".
•   Last call: no_open = "X", no_close = space.
•   device:Outputdevice(PRINTER, TELEFAX, MAIL). The default value         is PRINTER.
•   no_dialog: No dialog box for output.
•   preview: Print preview
•   langu:Language in which you want to print the form
replangu1, replangu2, replangu3: Alternative languages if the      form does not exist in langu
• startpage: Start page other than the top page in the navigation tree of the SAP Form Builder
• getotf: No printout, display or faxing, but OTF (Output Text Format)
            output to the table job_output_info-otfdata.