If you are talking about using all 3 to program the scanner, ie read the program with psredit, make changes and load it into the scanner and the using another to do the same thing, then the answer is no.
Only one program can use the com port at a time.
It could be that you may not have checked everything b4 sending it to the scanner in one of the programs ie arc500 default programming changed something.
The best thing to do is to use the last known program (psredit, win500,arc500) to reprogram it with a known file you have saved. FIRST default the scanner and the load the program.
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