From: http://www.tomshardware.com/forum/all.html?tag=multiseat

From: http://www.hacking-tutorial.com/tips-and-trick/how-two-users-logging-in-windows-7-or-xp-in-the-same-time-concurrent-session/#sthash.0HWonGkM.o7y1kmTf.dpbs

remote desktop

From: http://www.thinsoftinc.com/product_pc_sharing_betwin_ES64.aspx

BeTwin ES is the software that allows multiple users to simultaneously and independently share 
a personal computer running Windows 8/8.1 (32-bit).

From: https://www.userful.com/userful-desktop-virtualization

Streamline the deployment and management of a variety of digital displays with the simplest 
desktop virtualization software. Replace numerous physical PCs with affordable, low-wattage 
zero client devices all easily managed from one server. Any organization, from small retail 
stores to large call centers, can afford the flexible virtualization solution to reduce 
computing headaches and provide an exceptional desktop experience.