Application programs can use a set of global variables to verify the LU 6.2 options that VTAM® supports. The application program requests VTAM to initialize the variables by using one of the following macroinstructions:

• The VTAM macroinstruction ISTGAPPC
• The macroinstruction IFGRPL AM=VTAM
• The macroinstruction IFGACB AM=VTAM

The initialization of variables is done during program assembly, not during program execution. To have the indicators show the support for new functions that are in VTAM, you must reassemble the application program. Each global variable is an arithmetic symbol that can be set to 0, 1, or 2. The meanings of the numbers are:

X'00'

Option is not supported.

X'01'

Option is supported.

X'02'

Option is not provided by VTAM but can be implemented by the application program as a pass-through function of VTAM.