[SATLUG] what startup file to call xmodmap in XFCE

[travis+ml-satlug at subspacefield.org]

So I'm using XFCE in mythbuntu, and I'm not that familiar with the
startup script locations in these window manager packages (XFCE, KDE,
Gnome).

Supposing I wanted to call xmodmap whenever X was started, for any
user (or even for my single mythtv user), where would I call it?

Normally I'd use .xinitrc, but I'm not sure that gets invoked if you
log in via XDM.

What's the correct place to put it?

For that matter, how would I invoke ~/.profile each time, since I'm not
logging in through the method I'm familiar with?
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