&ISTGLRL      = release-level macro global character variable
                       (product, version, release, modification code)
     &ISTGLxy      = function-list macro global binary variables:
     &ISTGL00      = NIB ENCR and RPL CRYPT (cryptography)
     &ISTGL01      = ACB PARMS = (NIB=nib address)
                       (communication network management interface)
     &ISTGL02      = Multiple-address-space application programs
     &ISTGL03      = Authorized path for communication macros
     &ISTGL04      = Authorized path for all RPL-based macros
     &ISTGL05      = SRBEXIT (on APPL definition statement)
     &ISTGL06      = SONSCIP (on APPL definition statement)
     &ISTGL07      = VTAMFRR (on APPL definition statement)
     &ISTGL10      = SSCP tracking of device-LU session capability by
                       means of NOTIFY (enabled/disabled/inhibited)
     &ISTGL11      = RPL OPTCD=LMPEO
     &ISTGL12      = RPL OPTCD=BUFFLST
     &ISTGL13      = RPL OPTCD=USERRH
     &ISTGL14      = ACB PARMS=(USERFLD=user data)
     &ISTGL15      = RPL BRACKET=CEB
     &ISTGL16      = Application program assignment of sequence
                       numbers for expedited DFC requests
     &ISTGL17      = Resource-information vector list
     &ISTGL20      = Access-method support vector list
     &ISTGL21      = Return of system-response byte and extended-
                       response byte for BSC 3270 terminals attached
                       to NCP
     &ISTGL22      = INTRPRET
     &ISTGL23      = API is XRF-capable
     &ISTGL24      = Sense included with a negative response to CINIT
                       using CLSDST OPTCD=(RELEASE,SENSE)
     &ISTGL25      = Session outage notification code and sense included
                       with UNBIND
     &ISTGL26      = Control the scheduling of the LOGON and SCIP
                     exit routines to process session setup requests
     &ISTGL27      = CINIT network addressed in vector key X'15'
     &ISTGL30      = 31-bit application program
     &ISTGL32      = LU 6.2 is supported
     &ISTGL33      = Support for OPTCD=USERVAR for INQUIRE command
     &ISTGL34      = Support for VCNS
     &ISTGL35      = LAN support through the IBM 3172 Interconnect
                     Controller for token-bus, token-ring,
                     CSMA/CD, and FDDI
     &ISTGL36      = Cross-memory API is supported
     &ISTGL37      = VTAM maintains FRR stack for
                     application-dispatchable unit of work
                     while VTAM processes the work
                     (KEEPFRR on ACB)
     &ISTGL40      = Application program can use SRB processing
                     in exit routines (SRBEXIT on ACB)
     &ISTGL41      = Persistent LU-LU sessions supported
                     (PERSIST on ACB)
     &ISTGL43      = Enhanced data collection for NPM
     &ISTGL44      = Persistent LU-LU sessions tracking
                     supported for LU 6.1 and LU 6.2
     &ISTGL45      = Reserved
     &ISTGL46      = Reserved
     &ISTGL47      = Network-qualified names are supported
     &ISTGL50      = MS Transport is supported
     &ISTGL51      = Performance monitor interface is supported
     &ISTGL52      = QUEUED session termination supported (CLSDST
                     or TERMSESS OPTCD=(TERMQ))
     &ISTGL53      = CMIP services is supported
     &ISTGL54      = Generic resources supported
     &ISTGL55      = KEEPSRB supported
     &ISTGL56      = Application vectors supported on ACB macroinstruction
     &ISTGL57      = SETLOGON GNAME supported
     &ISTGL60      = FORCETKO support
     &ISTGL61      = User CV support