Anyone with a full retail copy of Starcraft II can now invite their friends with out a copy to join in. Spawning was an idea introduced in Warcraft II and the original Starcraft. It’s been one of the most requested features of the game, and it’s cool to see they finally added it in.

StarCraft II Official Game Site
Wage war across the galaxy with three unique and powerful races. StarCraft II is a real-time strategy game from Blizzard Entertainment for the PC and Mac.