Thank you for your post, and I apologize for the late reply.
No, there is not a way to stop a running schedule.
In the few tests I have performed, when I try to stop the server, it won't let me stop until the schedule has completed.
That explains the bug we've explored in another thread where a scheduled back up "hangs". I had to use the services control panel try to stop the service, got an error message, restarted the server and then waited several minutes while Server ran consistancy checks on all the open files--praying that none had been corrupted by the restart.
It would a really good idea if Filemaker issued a patch for server that permitted a safe interruption of a running schedule. We are risking file corruption when the above bug occurs.
If you are not running a backup script and the server script seems to be hung, try issuing the line command:
This should close the database files. This will close the files safely so you can reboot.
With a backup script, I don't have a complete answer, but issuing "fmsadmin close" does not not appear to work, as it appears that all files are locked until the script completes.