Request encoding

I've noticed that the data written to the REQM file changes dramatically, despite the command being the exact same. I can only assume that there's some kind of encoding going on there. Maybe not encryption per-se, but there something scrambling it, and with something more than just the simple command. There's some value that changes each time getting thrown into the calculation. But, without going in and doing something against the license agreement like disassembling, I can't think of any easy way to figure out what is going on in there. Suggestions welcome!