Windows XP SP2 will include a long-awaited concurrency feature that will let multiple users connect simultaneously to the same PC. The feature is mysteriously absent in the current SP2 beta release, and how Microsoft will implement the feature and how many concurrent interactive users it will support is unclear, but a Microsoft representative confirmed to me this week that the concurrent sessions feature, called “multisessions” internally, is happening. The next XP Media Center Edition (MCE) version, due this fall, will use the feature to enable as many as five Media Center sessions to remote Windows Media Center Extender devices.