Hi Konstantin,
OAuth is a standard protocol that is used by many web services.
You can read more about how to authenticate using OAuth by searching
online or reading these howtos:
http://oauth.net/core/1.0/#anchor9
http://answers.oreilly.com/topic/1381-how-to-use-three-legged-oauth/
You'll want to use an oauth library that abstracts much of this bits
out for you. Pick one that supports whatever language you'll be
programming in.
Also note that you'll have to swap the endpoints in the examples to
use GetGlue endpoints.
Karen