Here is my reminder program that is of course totally unsupported but has worked 
unchanged through many, many versions of VMS. All files should reside in one 
directory. I have set it up currently to run from SYS$LOGIN but you may put it 
anywhere so that users can share it. It needs no special privileges with the 
exception of being able to create a subprocess. It will create 2 files in your 
SYS$LOGIN directory:

MESSAGES.DAT which contains the actual reminders
MESSAGES.NEX which is used to determine when subprocesses wake up

When you add a reminder you have the option of having a reminder at one specific
time or automatic reminders (the default). Automatic reminder keep halfing the 
time between when the message was entered and when the event occurs. So if it's 
in 30 days it will remind you after 15 then in 7 more etc until the actual date 
at which time it halves the minutes between signing on and the actual event upto
1 minute before the event. If you have problems with the setup let me know. I 
have no plans to make changes to the actual program as I just don't have the 
time right now. You may pass this on or make changes as long as I get credit for
the original.

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 Bob Erkamp                                                      A L B E R T A
                           --> It Could Happen <--             R E S E A R C H
 erkamp@arc.ab.ca                                                C O U N C I L