Had anyone use " AT Command" in Windowws NT server. In other words I would like to use windows NT task scheduler.

Run at /? for full usage.
If you want to start using it for job scheduling, then this has been discussed througfully in the board, for example
here (http://www.baanboard.com/baanboard/showthread.php?s=&threadid=10109&highlight=jobs+at)