The demo version can't really be used by the "freeloader" simply because you can't do much of any use with 'em. You can, of course piddle around a bit, and, hopefully get a "feel" of how they interact with the user. I suppose that's important if you're likely to use 'em every week.

It's like those hardware simulators ... Some of 'em allow you to simulate SOME models but not all of 'em, i.e. not just any old otherwise valid model you happen to have. If you want to verify that two or three software packages produce the same result, however, or that they don't, or that the result isn't valid, then you have to be able to plug the same model into each and see what pops out. If you use the S/W-supplier-provided models, different in each case, all bets are off. If it allows you to simulate a circuit with a generic "mixer", say, but not a specific one, well ...

Likewise, if you want a piece of code that uses a large table, located in high memory, from a segment of code in low memory ... well ... what can you do?

RE