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The 'vms_syidef' module contains item codes, bitmasks and constants that are defined in '$SYIDEF'. These definitions are used by the vms_lib.getsyi() routine.

Access to details of the item codes is possible from the 'pyvms' module.

Related files:
- VMSDEF_$SYIDEF.DAT
- VMSDEF_$SYIDEF.MAR.
(See 'maintaining VMSDEF modules' for details)