This is a very basic tip. Quite simply it allows you to quickly test @Function code without the need to create forms and fields in which to place the code.
Step 1: Create a new memo
Step 2: Type you @function code in to the subject field of your new message, eg @Prompt([OK] ; @If("a" = "a" ; "It is true" ; "It is false") ; "Test")
Step 3: Hold-down the Shift key on your keyboard and press F9 Thats it!!! It will work in any text field in any database. Note: Not all code will result in a value that is visable, ie @Setfield()