In a message dated 8/16/2007 3:48:18 P.M. Central Daylight Time, [EMAIL PROTECTED] writes: >Also, with PARM usage, does R1 point to a pointer to the parm field? Yes, but only sort of. With PARM='xxxx' usage, on entry to the program R1 contains the address of a fullword. In this fullword the high-order bit (bit 0) is one. The right-most 31 bits contain the 31-bit address of the "parm stuff". The "parm stuff" starts out with the half-word length of the parm= character string. The character string immediately follows the half-word length. E.g., if PARM='123', then R1 might contain 00006FF4. At address 6FF4 you would find 80006FF8. At address 6FF8 you would find 0003F1F2F3. If no PARM info is being passed (PARM='' or PARM= is not specified), then the half word length contains 0000. Bill Fairchild Plainfield, IL
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