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> From: Michael Sperber <sperber@xxxxxxxxxxxxxxxxxxxxxxxxxxx> Tom> Every function should take an extra parameter which Tom> represents the particular Scheme instance under Tom> consideration. I might be running two different Scheme Tom> worlds in one process. > Can't you handle this implicitly? Or do you need to switch > between instances along a single call chain? I'd prefer to be able to mix them, for example to be able to write primitives which perform communication between them. I think of them as comparable to the DISPLAY* parameters in Xlib. It is a trade-off, I admit, between register pressure and fast/easy access to instance-specific state. -t