I know we have some 2-3 systems like cd-burners which does not any actual system on themselfs, just win9x.
and I feel sorry for you to have such programs that are so stupidly made that they don't want to co-operate with you.

anyway, in this particular subject, simple if might ably the best.

if @inwin<>1 or wrong_subnet exit 5000 endif
...
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!

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