Windows 7 lets you open multiple instances of a program, assuming that the program supports multiple instances. For example, if you currently have Notepad open, you can launch a second instance of the program.
One way of launching a second instance of a program is from the Start menu. A second, and much faster method, is to hold down the Shift key and click the program’s icon on the Taskbar. Windows 7 automatically launches a second instance of the program.