You have moved up in the technological world and now have two monitors. So now you want to compare two word documents, two powerpoint presentations or two excel files but they still open in the same window. In order to have multiple windows open of an application you must open the application the long route (not via your desktop shortcut) so you must click on Start, All Programs, Microsoft Office and then the application you want to open, Word, Excel, etc. Open your file and then repeat these steps to open another file, they will each open in their own windows for easy side by side comparison.
(Yes there is the option to View, arrange all but this can get complicated if you are using both your monitors.)