I had to debug the login page and I quickly got bored of writing my email/password in the emulator... If you have a Windows Phone device, you can enter these information with your fingers but if you debug with the emulator, you maybe want to use your computer's keyboard.
By default, the keyboard is not enabled but activating it on your development computer is easy:
- to enable the keyboard: press the PAGE UP key (or PAUSE key)
- to disable the keyboard: press the PAGE DOWN key (or PAUSE key, again)
It's fast and convenient, but some details may annoy you... For example, if you enable the keyboard, the emulator will not support the orientation changes. You have to disable the keyboard, and then rotate the emulator.
For more information on the keyboard mapping: http://msdn.microsoft.com/en-us/library/ff754352(v=VS.92).aspx