When you use your handset to surf, would you like to be able to turn on the display light and leave it on? Having the display lit makes to easier to read web pages. When you play a video, read email,or read a document, if you don''t have the software, after awhile the screen''s backlight switches off. The display will not stay lit unless you are entering some input into your phone. During video playback ,read document,read email,or surf, if you want the screen to be alight all the time, use the software! The software can turn the display on and off easily and make it show a continuous light.