Re: elevated privelages
Using the "run as administrator" option only runs the specified program as administrator. It does not change how you are logged in but only effects that one program. But note that by default programs inherit the rights of the parent process. If that one program you run as administrator opens others they will also have administrator rights that continue as long as they are running.
The purpose of the "run as administrator" option is to allow you to run an application with elevated privileges without the need of closing all open applications, logging out, then logging as an administrator.