aus "man screen" auf einem Mac:
-e xy
specifies the command character to be x and the character generating a literal command character
to y (when typed after the command character). The default is "C-a" and `a', which can be spec-
ified as "-e^Aa". When creating a screen session, this option sets the default command charac-
ter. In a multiuser session all users added will start off with this command character. But when
attaching to an already running session, this option changes only the command character of the
attaching user. This option is equivalent to either the commands "defescape" or "escape"
respectively.
HTH