Can Operating Systems Tell That They're Running in a Virtual Machine?

[techpr]

Vista Home Editions aren't allowed to be run inside a Virtual Machine, and Vista Ultimate in a VM will restrict access to applications which use DRM.This raises the question - is this a EULA restriction, or is it going to be enforced. Can it be enforced? Can an operating system tell if it's running in a Virtual Machine?

More... (http://digg.com/microsoft/Can_Operating_Systems_Tell_That_They_re_Running_in _a_Virtual_Machine)