Looking increasingly like RT => restart time, as in the entire Windows + Office ecosystem
"If you’re looking to buy a Windows RT tablet, security vendors said, don’t expect to be able to protect it with third- party antivirus or other security software. In fact, it seems that Microsoft may block third-party antivirus vendors from developing security solutions for Windows RT.Is Microsoft Blocking Antivirus Apps from Windows RT?
Microsoft won’t allow such software to be sold on its online store, which is the only way to load applications onto Windows RT devices, security vendors say. It’s not known whether Microsoft will develop its own security solution for Windows RT, although most security observers assume Microsoft will do so."