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Sorry. :p
I don't know enough about screen or servers to help you there. I'm sure someone will come along who does.

Screen is a pretty complex monster. There is a command to list sessions...
screen -ls
screen --listYou might be able to incorporate that output into your scripts.
See man screen

RE: status
If you are going to test Pidfile for zero lines, if test `ps -e | grep -c $Pid` = 0; then... try > $Pidfile # instead of echo $! > $Pidfile when you 'stop' or initialize $Pidfile