The last two lines of my
.xinitrc looks like this
xterm -g 80x24+10+10 -bg black -fg green & metacity
When I used
twm, I could exit it from the menu (return to the
tty where I run
xinit), but how do you exit
man metacity does not mention this, but it refers to the panel menu (which I don't have). Maybe it's there?