Example:

       GTM>ZPRINT ^ZBTEST
       ZBTEST;
       DO SUB
       QUIT
       SUBWRITE !,"This is ZBTEST"
       QUIT
       GTM>ZBREAK SUB^ZBTEST
       GTM>DO ^ZBTEST
       %GTM-I-BREAKZBA, Break instruction encountered 
       during ZBREAK action
       At M source location SUB^ZBTEST
       GTM>ZSHOW "B"
       SUB^ZBTEST
        

This inserts a ZBREAK with a default action at SUB^ZBTEST. After GT.M encounters the BREAK, the ZSHOW "B" displays this as the only ZBREAK in the image.

Example:

       GTM>ZBREAK -*
       GTM>ZGOTO
       GTM>ZBREAK SUB^ZBTEST:"W !,""Trace"""
       GTM>DO ^ZBTEST
       Trace
       This is ZBTEST
       GTM>
        

This removes all existing ZBREAKs with a ZBREAK -*. Note that it is not necessary to remove ZBREAKs before modifying them. It also clears the process invocation stack with an argumentless ZGOTO. Then it uses a ZBREAK to insert a trace-point. Every time GT.M executes the line to where ZBREAK has established a trace-point, it performs the specified action without entering Direct Mode.

Example:

          ZBREAK PRINT^TIME::5
        

This BREAKs execution at line PRINT in routine just before the fifth time the line is executed.

Example:

          ZBREAK PRINT^TIME:"WRITE AVE BREAK":3
        

This inserts a ZBREAK action of WRITE AVE and BREAK before the third execution of PRINT^TIME.