Hi again, coolfrog!
I told someone about gdb just the other day. Was that you? Anyway, gdb is a command line debugger. You invoke it from the command line by
gdb myprogram
and then use a set of text commands to run, set breakpoints and stuff like that. A program must be compiled with the '-g' option to gcc if you want to debug it. The '-g' option adds a lot of symbolic information to the code which the debugger reads. When your program works and you want to "ship it" that option should be turned off.
Now, over to your question. If you have installed a full Fedora Core 2, then you have a debugger in the menus: Programming > Debugger. This is a graphical front-end to gdb. It's pretty well documented too.
Good luck! How soon will we see great software coming from Coolfrog corporation?
Martin