From LedHed's Wiki
The at command is kind of like a scheduled task or cron job.
Usage:
at time command
Example:
at 23:00 chkdsk c: /f
This will run a disk check at 11:00pm
Contents
Scheduling commands on Remote Systems
at \\REMOTE_HOST 12:00 del c:\log.txt
This will delete c:\log.txt at noon.
Viewing Job Schedule
Just type at.
at
Deleting Scheduled Commands
at ID /delete
Where ID is the job number, which can be obtained by running the at command as stated above.
Interactive Jobs
If you want the scheduled command to interact with the logged in user then pass the /interactive option.
at \\REMOTE_HOST 15:30 /INTERACTIVE "%ProgramFiles%\Windows Media Player\wmplayer.exe" fart.mp3
This will play a fart sound on the remote host at 3:30pm. ;)
An example of when you would want to do this can be seen in this RickRoll article.