They have Xenserver which allows you to virtualize several servers on one device and they use a hypervisor so you don't even need Windows although you can run Windows or Linux in these virtual sessions.
I don't see why they need to advertize on Rush anyway. People that need what Citrix offers know where to go.
They are going to feel stupid when they find out the truth of this operative Rush is talking about...
Most people who use Citrix because of the Rush ads aren’t using the products you’re talkiing about. They’re using GoToMyPC for remote PC access, with a few using GoToMeeting for conferencing. Citrix doesn’t advertise XenApp on Rush Limbaugh :P