User`s guide

Macros for Porting from VAX to Alpha or I64
$UNLOCK_PAGE
If the error parameter is used, the error label must be placed outside the
scope of the $LOCK_PAGE and $UNLOCK_PAGE pair. This is because the
error routine is branched to after returning from the subroutine created by the
$LOCK_PAGE and $UNLOCK_PAGE routines.
Macros for Porting from VAX to Alpha or I64 D–11