Clicks
OpenVPMS, because it runs in a web browser, does not recognise double clicks. So if you are a windows person used to double clicking on things then you may get confused.

Always use single clicks - or if you like to think of it this way, a slow double click.

So for example, on the schedule screen, to create a new appointment, don't double click the time slot, click it once (to make the New... appear) and then again to create the appointment.

Similarly, on the products (or any other select) screen, click the item of interest to select it, and then click again to open it for editing.

Keys
The following keys are really useful:

Alt-F - Holding down Alt and then pressing the F key is equivalent to clicking the Find button. Hence on the Schedule or Work List (or any other select) screen, you can use Alt-F to cause a refresh of what you are looking at.

Alt-V - On most screens that have a Print button, you can hold down the Alt key and then press the V key to immediately preview the output without calling up the Print screen.

Enter - Pressing the Enter key means ‘do want you can with the stuff I have entered’.  On a select screen,  with the cursor in a search field, it is equivalent to pressing the Find button; on a data entry window, with the cursor in any data field, it will expand any macros, do any propercasing and look up any search fields.

Note however, that pressing the Enter key is not equivalent to pressing the Apply button because the record will not be saved until you press either Apply or OK.

Tab - Pressing the Tab key will jump you to the next field on the screen, Shift-Tab to the previous one.

PgUp/PgDn - where information is being presented in pages (like on the Products|Information screen), pressing the Page Up and Down keys will display the previous/next page of data - provided that you currently have one of the data items selected.  (That is, if you have the cursor positioned in one of the select fields, then the Page Up and Down keys will have no effect.)