Release-level and component-ID macro global variables

When ISTGLBAL, IFGRPL AM=VTAM®, or IFGACB AM=VTAM is assembled as part of an application program module, the &ISTGLRL macro global variable is declared and set with a character string that specifies the release level of the library containing ISTGLBAL. The &ISTGLCI macro global variable is declared and set with a character string that specifies the component identifier of VTAM. Later in the assembly of that module, these GBLC variables can be accessed by other macroinstructions and by open code.

The character string with which &ISTGLRL is set indicates the following:

Table 1. Release-level macro global variables for VTAM V6R1.2
Byte no.	Contents	Code indication
0	0	Product (0=VTAM)
1	6	Version 6
2	1	Release 1
3	2	Modification Level 2

The following example shows how the variable might be used in a macroinstruction defined by an application program for V6R1.2:

         MACRO
         WHATVTAM
         GBLC  &ISTGLRL
         AIF   ('&ISTGLRL' EQ '0612').LABEL1
VTAMLEVL DC    C'THIS IS NOT V6R1.2 OF VTAM'
         MEXIT
.LABEL1  ANOP
VTAMLEVL DC    C'THIS IS V6R1.2 OF VTAM'
         MEND

If the V6R1.2 level of either ISTGLBAL, IFGRPL, or IFGACB is coded, the WHATVTAM macroinstruction causes the generation of the first DC statement at assembly time. If you use an earlier release of ISTGLBAL, IFGRPL, or IFGACB, or if none of these three macros are issued in the assembly, the second DC statement is generated, indicating that the level of VTAM used is not VTAM V6R1.2.