Game or software applications always need to be made usability testing by professionals before going public. Only in this way, can the development of software be completely finished. And this needs a lot of people to cooperate to complete the usability testing, so the testing process always costs a large amount of time; or has to invite others to make tests spending a lot of money.

Microsoft destroyed their classic start menu in Windows 8. Afterwards, they knew that is a mistake, so in the updated versions of Windows 10, they restored this convenient feature that every Windows user is familiar with and used to use (although they tried to hang in there to see whether it's possible to force users to be used to use their new Metro Menu design in Windows 8 and the early versions of Windows 10), even if it is still not perfect enough (just switching between Metro and desktop). This case, we have to turn to third-party software for help.

Occasionally, I need to save some web page with a lot of pictures as a PDF file. To do this, copying all the content to a word document is a bad idea, because that usually leads to a messy format. Therefore, I often either use browser's built-in PDF printing function, or install and use a standalone virtual printer to generate high-quality PDF document meeting my needs.

I have some videos taken with old-fashioned digital cameras, and they turned out to be 'lying' when played in PC's media player. I made several attempts to seek some software with the similar function of rotating images in Windows Photo Viewer. But never found it. Fortunately, I finally came across this tool specially designed to rotate video - Video Rotator.

For the running speed of computer, physical memory plays a very crucial role. But as a matter of fact, when a computer runs a period of time, its available physical memory (RAM) resource may become less and less due to some reason it can't get recycled effectively. And if there is not enough memory available, then this will seriously affect the running speed of system and applications.