DualVideoPlayer

There are various video formats available and as many applications capable of playing them. Performing a quick search you might stumble upon DualVideoPlayer, which is one of them. It promises to deliver all features of a modern media player with the possibility to play not one, but two clips at the same time.

Lightweight and easy to use

Launching the application won't have you worrying about the amount of CPU used, as it only requires a little to run smooth, while only taking up around 1 Mb of space on your hard disk drive.
The main window is split into two sections, each fitted with its own playback options and volume sliders. Dragging borders around gives you the possibility to adjust window size, but “Movie B” suffers the most, with no option to make both preview sections equal.
Unfortunately, you are only able to load files through a dedicated option for each section, drag and drop function not being supported by the application.

Limited features put at your disposal

If you're hoping to run movies smooth you need to have a proper version of Windows Media Player installed on your computer, as it is strictly related to it. Keeping this in mind, it is but a shame that you are not able to save nor load existing playlists.
Moreover, the application gives you the possibility to switch to a fullscreen mode, but it only works for one section, leaving you to resize the main window for a greater view of both. Last but not least, using it to spot any differences in two clips can be difficult, because there is no option that allows you to simultaneously start both of them.

To end with

Taking everything into consideration, we can say that DualVideoPlayer is as straightforward as can get, with limited features available. Even though it is closely related to Windows Media Player you cannot make use of its features to compensate for the ones that are not implemented. Overall, it's only good to play a different video for two individuals using the same computer.