Remind me on date/time can be set on a certain date or on a date and time, meaning the remind on field can handle both but Microsoft Access will show you only a date select, if you want a date and time you will need to manually add the time after you selected the date.
If you do not specify the sender email address, the value from the Sys Config will will be the fall back value that is going to be used instead.
The CC Helpdesk address is as well specified in the Sys Config table.
You can automatically re-schedule the reminders on defined intervals. This is based on a table and fixed intervals. As of now, there is now day of the week or 3rd weekend of the month implementation, if you would need that, just adjust the code to accomplish this.
Finally there is a emailed checkbox. If this box is set, no email will be send out – by default it remains unchecked till a email was send out.