General :: Screen Start / Stop Script With A Name?

What I want to achieve is that I can start and quit a process that is running in a screen, with using a script.

Like start.sh that does "screen serverapp1 ./serverapp1"
and stop.sh that does "kill serverapp1"

I already tried something like that, but it didnt work. The kill command only works with process ID's and that one is variable.

EDIT:
What I've tried (because google is my friend):

[servercod4001@datacenter-196 ~]$ screen -ls
There is a screen on:
11343.servercod4001 (Detached)
1 Socket in /var/run/screen/S-servercod4001.

[Code]....