Dual Display Manager Downloads
Connecting a second display to a Windows PC yields limited benefit: by default, your only two choices are to extend the existing desktop to the second monitor (with a few caveats) or to mirror the primary display on the secondary monitor.
The applications from this set will help you make full use of your second monitor by specifying what exactly you want it to display, and in what proportions. Some of these applications will also let you use various devices as secondary displays: other PCs, iPads, Android tablets, etc. - sometimes wirelessly.