/sys$common/syshlp/DBG$HELP.HLB
DEBUG, CANCEL, BREAK, Qualifiers, /USER
 *Conan The Librarian 

    Cancels a specified user-defined breakpoint without affecting any
    predefined breakpoints. This is the default unless you specify
    /PREDEFINED. To cancel all user-defined breakpoints, use the /ALL
    qualifier.
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