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By hitting alt-ctl-F1-4 I can go to these login screens. If I type startx it says that x is already running. What do most people use these for? Can I use them instead of opening xterms in my WM? Can I use it to run two WMs? I know that'd be a crazy use of resources, but is it possible?
There are multiple virtual consoles in most versions of Linux. When you start the computer, consoles 1-6 (i.e. F1-6) are created. When you start an X session, it usually binds to F7. You can use any of these at any time, it is like an xterm, but does not require X. This is what was used before X came along.
As far as starting multiple X-sessions - that is a different issue. I know there is a way if you are gnome - look in the menus for 'new login'.
You can use Xnest to run several different window managers at one time if you want. It works by allowing you to nest additional Xsessions inside of already running Xsessions. I think Xephr might also do this.
I've never done this and I don't really want to test it right now but I think it'll work. Hit Alt-Ctrl-F2 and type startx :1, that *might* start another X server on vt/8 (Alt-Ctrl-F8).
If you have a window manager open, there is very little difference. There will be a little more memory used by the xterm, etc, but only a little. On the other hand, they are meddlesome to get to, and I find it is easier to use an xterm.
It's more of a matter of choice than one of importance.
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