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