HP NonStop Pathway/iTS Programming Manual page 171

ZPWY-MAP- Definitions
ZCPU
returns the primary processor.
ZPIN
returns the primary process ID number.
ZBACKUP
returns the processor and PIN of the backup TCP:
ZCPU
returns the backup processor.
ZPIN
returns the backup process ID number.
NonStop Pathway/iTS Management Programming Manual—426749-002
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ZPWY-MAP-STATUS-TCP