Library /sys$common/syshlp/dbg$help.hlb DEBUG, Messages, WPTTRACE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 non-static watchpoint, tracing every instruction

    Facility: DEBUG, VMS Debugger

    Explanation: Setting a watchpoint on a non-static location such
    as the stack or on a register forces the debugger to trace every
    instruction that is executed. This will slow down execution of
    your program by a considerable amount.

    User Action: If you do not want execution of your program slowed
    down, then you must cancel the watchpoint.