Cross-reference of parameters

Alternate Access parameters for sessions can be defined in the parameter list members.

For more information, about:

• Started task EXEC or PROC statements: You can specify a default set of session initialization parameters for each session by defining a parameter list member’s unique two-character value as nn to SUF on the PROC statement of either the LAS or the TAS startup procedures or to SUFFIX on the TAS EXEC statement.

  The procedures may reside in SYS1.PROCLIB or some other procedure library.

  For information about customizing the TAS or LAS started task, see Step 6: Defining a TAS startup procedure or Step 8: (Optional) Defining a LAS startup procedure.

• START command: You can point to a different parameter list member in the START command by overriding the value that is specified in the PROC statement SUF parameter by issuing an S PRDxAS,SUF=nn command.

  • For information about starting AutoLogon sessions for VTAM sessions, see Defining the START command for VTAM AutoLogon sessions.
  • For information about starting the LAS, which supports the terminal user-issued LOGON or abbreviated logon commands, see Starting and stopping the logon address space (LAS).
  • For information about starting AutoLogon sessions for EXCP sessions, see Defining the START command for EXCP AutoLogon sessions.

• Terminal user-issued LOGON or abbreviated logon command (VTAM access only): VTAM session users can issue the LOGON or abbreviated logon command from a terminal that is connected to the VTAM network and can define a subset of the session initialization parameters. Specifically, users can specify the VTAM minor node name in the APPLID( ) parameter and the user ID/password combination in the DATA( ) parameter.

  For information about the LOGON command, see one of the following sections:

  • Using the LOGON command
  • Using the abbreviated logon command

  At TAS or LAS initialization, Alternate Access reads parameters from all locations in a specific sequence:

  1. Parameter list member
  2. Proc JCL
  3. Operator-entered START command or the VTAM terminal logon command

As the parameters are read, the following actions occur:

• The parameters are merged as each location is read in sequence.
• Duplicate parameters that are defined in more than one location are overwritten as the merging sequence progresses.
• Default values are substituted for required but undefined parameters.

The cross-references of TAS and LAS parameters in the following table are designed to help you understand where each parameter can be defined and overwritten: 

TAS Parameter	Parmlib Member	Proc statement (PROC or EXEC)	Operator START command	VTAM terminal logon	Used with VTAM, EXCP, or BOTH
ACCOUNT	X		X		BOTH
CAPS	X		X		BOTH
DEVGROUP	X		X		BOTH
LOGON	X		X	X	BOTH
LOGON APPLID	X		X	X	VTAM
LOGON DATA	X		X	X	BOTH
LOGON OPT	X		X		BOTH
LOGON TERMID	X		X		VTAM
LOGON UCB	X		X		EXCP
P		PROC	X		BOTH
SUF		PROC	X		BOTH
SUFFIX		EXEC			BOTH
SYSPREF	X		X		BOTH
userID			X		BOTH
APPLID	X			X	VTAM
CAPS	X				VTAM
PROCNAME	X				VTAM
SUF	X	PROC	X		VTAM
USS	X				VTAM