When you've finally accumulated enough computer junk, you'll find youself attaching a second monitor to your computer. ratpoison has functionality to help you get around your new and improved desktop space.
The X Windowing System assigns each monitor a screen number. To switch
to another screen use the commands nextscreen and
prevscreen. ratpoison will tell you which frame has focus by
drawing the current frame indicator in it.
Many commands operate only on the current screen. This becomes
apparent when you have 2 screens each with 1 frame. In each frame you
have an xterm. If you try to switch to the other xterm with the
command other, for instance, you'll get a message "No other
window." ratpoison means there's no other window to switch to in the
current screen. If you want to switch to the other xterm you can
switch to it by name (use select or C-t '), by number,
or you can use nextscreen and prevscreen.