Locking the Main screen prevents the user from accidently modify or delete data. This lock feature is not password protected and provides no security. It simply causes all fields on the screen to be locked from editing and deleting data until the screen is unlocked.
You can lock and unlock the screen by pressing the lock button at the bottom of the Main screen.
When the button is pressed in the screen is locked; when the button is not pressed in the screen is unlocked.
To have the program start with the screen locked, check the Lock Main form upon startup option.