Yes, VS6 has something like ctags built in. Ctrl-] does paren matching, ctr-k will jump to the enclosing #ifdef (if there is one). Right-click a function name and pick "Go To Definition" to find the definition of a function (don''t know the keyboard accelerator for that one). For VS6 to find a symbol, it has to show up in the project. The other one I use is find in files (I bind this to ctrl-shift-F).

When it comes to reading other people''s code, it''s not enough to understand the language. You have to start from the beginning and learn how the author programs. The way I prefer to do it is to first realize what the program does. What I then do is think of the different ways that I could make a program like that... the better you become at programming, the better you will become at this. Once I have a list (in my head.. I don''t spend more than half a minute on it), I look through the source for their implementation of these techniques.. everything else usually falls into place. Problems arise when I''m looking at things I''m not familiar with.. when it comes to that, I''ll either read up on the techniques that the game uses or try to crawl through the code and figure out what the heck the author was doing.