in fact, only mentor'boardstation(en2002) supports true-concurrent design
methodology.but some such as allegro,powerpcb be able to do same work
if you divivde your designs to modules
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PCAD 8.5 DOS
PCAD 2001 using Macro commands
Mentor Graphics C4S V8.
Allegro but YOU have to know wht I you doing with scrip file and who is driving scripts or you can use safe clip load with separation of the board.