General GDS Variable Format

Table 1 shows the general format of the header of the SIGNON/Change password GDS variable. The remaining tables in this section show the sub-fields that are required on the SIGNON/Change password GDS variable for each type of request or reply.

Table 1. General Format of SIGNON/Change Password GDS Variable
Byte(s)	Value	Description of Contents
0-1	`xxxx`	`xxxx` - The length of the entire GDS variable, including the length of this field.
2-3	X'1221'	The SIGNON/Change password GDS variable identifier.
4-5	`yyyy`	`yyyy` is the length of this field, plus the length of all the fields that follow this field in the GDS variable (the length of the nested data structure).
6-7	`zzzz`	`zzzz` is one of the following: X'FF00' The request is to sign a user on. The allocate request flows from the requestor LU to the server LU. See Table 1 for the sub-fields that accompany this request. X'FF01' The request is to sign the user on and change the user's password. The allocate request flows from the requestor LU to the server LU. See Table 1 for the sub-fields that accompany this request. X'FF02' The server LU sends a reply to the requestor LU that contains the results of a "sign-on" or "sign-on and change password" request. See Table 1 for the sub-fields that accompany this request.