Use screen −r to re−attach to your previous screen process and access your servers again.
That's all there is to it. See the screen(1) man page for more detailed information.
How can I keep the mouse from leaving the window in X? ++
From the Quake II readme.linux file (this applies to all version of Quake):
By default, the mouse will not be 'tied' to the Quake2 window. To cause Quake2 to grab the
mouse, select 'Windowed Mouse' from the video menu, or type '_windowed_mouse 0' at the
console. Do the reverse to release it. You can bind keys to grab and release the mouse in the
console, like so: bind i "_windowed_mouse 1" bind o "_windowed_mouse 0" Then "i" will
grab the mouse and "o" will release it.
Linux Quake HOWTO
How can I start a server and log off, then come back to it later? 37
When I run Quake/QuakeWorld/Quake II under X, the image only takes
up half the window and/or the colors are all funny. ++
The X clients only support color depths of 8 and 16 bits per pixel. Your X server is probably running at 24 or
32 bpp. Change the default color depth to 16 bpp and this problem will go away.