Questions[gnu-screen](ubuntu)

I'm trying to kill a screen session. I noticed a lot of other related questions, but none of those answers are working for me. I am trying to kill the following session:

screen -ls
There is a screen on:
    23520.pts-6.porkypig    (09/30/2013 02:49:47 PM)    (Detached)
1 Socket in /var/run/screen/S-root.

screen -r 23520.pts-6.porkypig

Now I am in the session. According to the documentation:

http://www.gnu.org/software/screen/manual/screen.html#Quit

I am supposed to press "control a" and then "control \". I do that and nothing happens.

Another solution said to press Ctrl+a and type :quit. However, again it doesn't do anything. In fact, pressing control+a, absolutely nothing happens afterwards except a message "No Other Window"

I know how to start a screen, and how to list different screens:

screen -ls

or to attach:

There are screens on:
        2477.pts-0.server1      (Detached)
        2522.pts-0.server1      (Detached)
2 Sockets in /var/run/screen/S-root.

$ screen -r 2477.pts-0.server1

But what is the key combination to detach from a screen session and keep it running?

I recently installed GNU screen on a machine I ssh into. How do I get GNU screen to use 256 colors?

So far, I've tried adding the following to my .screenrc:

term screen-256color

and

attrcolor b ".I"    # allow bold colors - necessary for some reason
termcapinfo xterm 'Co#256:AB=\E[48;5;%dm:AF=\E[38;5;%dm'   # tell screen how to set colors. AB = background, AF=foreground
defbce on    # use current bg color for erased chars

but neither worked.

In the login shell, before I start screen, when I run this script, which prints 256 colors, I get normal output. When I use the command tput colors I get the output 8.

When I start screen and run the script, I get 16 colors mapped to 256 colors - there are large blocks of solid color. When I run tput colors I get 256 (when term screen-256color is in my .screenrc).

edit: I got it to work - I didn't configure screen with the --enable-colors256 option.

I want to copy some text from screen to my clipboard. I know how to get into copy and paste mode in screen, but I want that text to go to my clipboard so I can paste it on the browser, for example.

How do I do this? Thanks!

I use GNU Screen constantly. But, I've been trying to figure out if there is someway to get X11 apps to forward over screen when I am ssh-ing (Is that a word?). Currently if I try to run 'gedit' through screen, it opens on my 'server' computer and not on my client. If I do the same outside of screen, then everything is fine. But I want everything to be fine when I use screen too!

Thanks!

PS: I have googled the problem and I see mention of xmove, but I can't seem to find the package that contains xmove on my ubuntu. (ubuntu 10.10)