Your questions suggest that your interest in understanding TCL goes beyond simply getting the job done. The answers require a knowledge of scoping, namespaces, and the parser; upvar can be a conversation in itself. Such topics (and their interrelationships) can only be properly described in a book where the author has taken the time to clearly things out. I've been using TCL/TK and vTCL for several years now as someone interested in putting graphical wrappers on other programs, hence I haven't taken the time to master very advanced topics. But I've gotten some really cool things done really quickly (and surprised the bosses as well). I have found Brent Welch's book Practical Programming in TCL and TK to be well worth the cost. In fact, some of the basics are free at http://www.beedub.com/book/. If you're not in a serious hurry to get a product out the door, checking out this book and others will be time well spent.
I think TCL/TK, vTCL, and the other extensions (say, at http://resource.tcl.tk/) are just about the best programming tools around in terms of ease of use (programmer and user), and maintainability. If you intend to stick with TCL etc, investing time in the details will pay off nicely.
Good luck.
-Chris.
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