Programmer's WorkBench (pwb.hlp) (Table of Contents; Topic list)
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386 Debug Registers (/R)
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     On machines with an 80386 processor, CodeView speeds up debugging
     by using the four 80836 debug registers to implement certain types
     of breakpoints (break on change in memory area) through the
     processor itself.
 
     CodeView does not use the debug registers if you use a watch
     expression or if you specify more than four breakpoints that break
     on changes in memory areas.
 
     The command-line equivalent is /R.
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