Microsoft Games Studios has launched Games for Windows Live, enabling PC gamers to play with or against the Xbox Live community.

The release of Shadowrun connectes Windows Vista with Xbox 360 players in cross-platform matches through a single service. Whether in cooperation or competition, PC and Xbox 360 gamers can battle up to 16 players in the intense first-person shooter combination of modern weapons, ancient magic and advanced technology.

This marks the first of many games to come which will support the Games for Windows Live service, connecting millions of Xbox Live members and Windows gamers. Games for Windows Live brings the best of the Xbox Live service to Windows gamers, such as a single online identity, the ability to easily find and connect with friends, and earn achievements.

Microsoft Games Studios has also launched Halo 2 for Windows Vista, delivering improved graphics, a custom map editor and the chance to earn achievements – a first for the Halo franchise. Using a combination of dedicated servers, flexibility of the Windows platform, and the online innovation established in the Xbox version, Microsoft says Halo 2 for Windows Vista provides a best-in-class PC-to-PC multiplayer experience.

Current members of Xbox Live automatically receive the functionality of Games for Windows Live, using the same gamer tag and friends list, at no additional cost. In addition, GfW Live provides PC gamers with integrated in-game multiplayer voice chat and Achievements, as well as dedicated server support, as part of the free Silver membership. Gold membership adds benefits such as multiplayer achievements, matchmaking according to skill, reputation and gamerzone, as well as cross-platform gameplay.