In MUSHclient, how do you create a window that you can send stuff to? Like, capturing channels, or other sorts of things to keep from being missed amidst spam? Its something I've never bothered with, but I had an idea that would require it, so, i'm now in need of a bit of guidance

You have to send the text to a notepad window (and not notepad as in Windows Notepad, either). Notepad windows cannot handle colors or complex formatting, so you'll be stuck with one color setting for the window. I believe some people have managed to use several world files and send text between them, similar to the way it works in zMUD when you create capture windows with their own sets of triggers, colors, etc.

I'd recommend that you search the MUSHclient forums for channel capture scripts.