This doesn't address your specific question, but what about this: I assume that when your wife uses linux, she normally logs in from the console (on one of the text mode consoles), and occasionally then wishes to run a few X applications. If so, then she can just do: startx -- :1 This will give her her own X display (on the next available virtual console, probably number 8), and she need not mess with any xauth stuff. (just make certain that "Console" is in /etc/X11/Xserver) If you do this, you'll also probably want to make a symbolic link from ~/.xinit to ~/.xsession (startx uses .xinit, xdm uses .xsession). Supposedly, one should be able to get xdm to start up with two X servers on two different virtual consoles, (and therefore two login screens) but every time I've tried it it just hung my xdm.
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