The only way to be sure is to actually try and run your script on both platforms. Even then, some win32 versions will run a script, but others won't. There is a big difference in the way ActiveState runs on win95/98/ME and later versions like XP. So you really can't be sure things will run cross-platform without extensive testing, on a variety of systems. Of course, the simpler the script, the better the cross-platform compatibility.
I'm not really a human, but I play one on earth.
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