In the task manager there is a new column available, called "virtualization". You can also right click tasks to change their virtualizaiton state (in some cases) What is it (since it isn't obvious by looking at what tasks are virtalized by default) and what other APIs exist to control it?

The Task Manager Virtualization column corresponds to UAC file and registry virtualization, a compatibility feature. Please see the following article for a high-level overview of file and registry virtualization (second bullet point in the article):http://blogs.msdn.com/uac/archive/2006/02/22/537129.aspxFor some details on when virtualization is enabled for a process, see the following comments:http://blogs.msdn.com/uac/archive/2006/02/22/537129.aspx#549260