This is the Reminders & Alerts tab of the Visit Editor. See Concepts|Reminders for background.
[Careful observers will note that this is a screen shot from a system using a modified label for the Find button and right justified field labels.]

The non-standard buttons are as follows:
OK - save any changes and close the Visit Editor
Cancel - cancel any changes and close the Visit Editor
New - create a new alert or reminder
Edit - edit the selected item
Delete - delete the selected item - a confirmation window will be displayed

This screen is very similar to the Patients|Medical Records Reminders/Alerts tab - see this for further information.