Go through the settings of the applications you need. They may be "Run on top of other Windows" to activate it. But there are such programs, priority is impossible to establish a systematic method, and require the use of special applications.
Use one of several convenient and free software such as DeskPins. This application is suitable for all versions of Windows. The only drawback is in English.
Run the program after installation and click on its icon on the task bar with the left mouse button. After that, the cursor changes to a small nail. Move them to the desired window and set it on top of the other. Another click on the tray icon takes hold. Also activate the mode on top of other Windows Ctrl+F12.
Install alternatively, another popular free program called OnTOP. Unlike DeskPins allows you to secure it on top. However, she is completely in Russian.
Run the program and paste in the special list of those applications that you run have to run on top of other Windows. As a result, when OnTOP is launched, any of added to the applications list will automatically be over others. You can also use additional parameters. For example, clicking on the "Advanced" button you can change the window size, indicating the appropriate length and width.
Also try to change the location of the window by placing a tick in the appropriate place. In addition, you can set the window transparency that makes them look nicer and it allows you to see what apps are running in the background.