The REMIND command is used to cause a message to be sent to a user
at some future date or time.  Here's an example.

REMIND/DATE=5-JAN-76/TIME=1200 FOO Don't forget our meeting.

To delete a reminder, type CANCEL<return> and your pending reminders wil
be listed and you will be allowed to delete them selectively.

For more information, see the MAIL section and the MAIL appendix in the
Monitor Command Manual, SAILON-54.6, online as MONCOM.BH[S,DOC].