function _resumescreen()
{
 test ${TERM/\.*/} = "screen" && return 1  #do nothing if inside screen.
 test ${TERM/\.*/} = "dumb" && return 1  #do nothing if inside screen.
 test ${TERM/\.*/} = "su" && return 1  #do nothing if inside screen.
 screen -q -ls       #check if we have any screen sessions running
 test $? -ge 10 && screen -xR  #and auto login if we do.
}

_resumescreen