rem man page
rem — Invoke Remind with a default filename
rem [options] [date] [*rep] [time]
rem is a symbolic link to remind. When remind determines that it has been invoked as rem, it uses a default filename rather than expecting a filename to be supplied on the command line.
If the environment variable DOTREMINDERS is set, remind uses the value of DOTREMINDERS as the filename. Otherwise, remind uses the filename $HOME/.reminders
Remind was written by Dianne Skoll <firstname.lastname@example.org>