how does adb/dbx work?

[Stephen J. Hartley]

I was wondering if somebody could explain how adb (and dbx) executes programs.
Does it have a software simulator that interprets the instructions in the
object file of the program being debugged?  Or does it use the VAX hardware
to execute the program, say by hardware single-stepping?  I could trudge through
the code, but I was wondering if somebody already knew.  Thanks.
-- 
"If that's true, then I'm the Pope!"		Stephen J. Hartley
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