CodeView (cv.hlp) (Table of Contents; Topic list)
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Set Breakpoint: At Location When Expression has Changed
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     ┌─────────── Set Breakpoint ───────────┐
     │                                      │
     │( ) Break at Location.                │
     │( ) Break at Location if Expression   │
     │    is True.                          │
     │( ) Break at Location if Expression   │
     │    has Changed.                      │ ┌ ■ Select this option
     │( ) Break When Expression is True.    │ │
     │(•) Break When Expression has Changed.─┘ ■ Enter breakpoint
     │                                      │   │ location
     │  Location: [·············] ─────────┼───┘
     │  Expression: [············] ────────┼── ■ Enter expression
     │┌Pass Count: [·····] Length:[······] ───┐ to watch for changes
     ││ Commands: [······················]  │   │
     └┼──────────────────────────────▲──────┘   ■ Enter optional range
      │                              │            to watch for changes
      │                              │
      ■ Enter optional pass count    ■ Enter optional commands to
                                       be executed at breakpoint
 
     See: Break Addresses
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