Getting There
Return to Last File is accessed from the Main menu. Select => File | Return to Last File, or use the shortcut Shift-F9.

Description
Return to last file will take you back to the last file you were working on if you are currently working on any other file. This comes in handy if a customer calls back wanting some information that you were just working on.
NOTE: Using Shift+F9 will return to the last file if that file was found by using F9.