Hi Tim.Hope everything is fine with you.
In the help file, under "Showing the Initial Login Form", it states:
"Once the LoginFormType has been set (or left to the default value), you can call the Login.ShowLoginAndAuthUser() method to show the login form and authenticate a user into the system. The method will return a Boolean value indicating whether the end-user was authenticated or he/she canceled out of the form and the application should exit."
Does this answer it?
Hope it helped.