Uses or meaning of srw.user_exit('PO ARCHIVE_DOCUMENT )

Hi,

Does anyone knows the purpose or meaning of below user exits,

srw.user_exit('PO ARCHIVE_DOCUMENT DOCUMENT_TYPE="PO" 
                                          DOCUMENT_SUBTYPE=":poh_po_type"
                                          DOCUMENT_ID=":poh_po_header_id"
                                          PROCESS="PRINT"');

Thanks,

Rajesh