How to leave fingerprints on the touch screen for about a second when the mobile phone is running in ink weather and other programs are running? Seek an explanation

This is the exclusive signature of the development designer! Many software and games have such signatures or logo, but ink developers use their own or the president's fingerprints! In the earliest cs 1.5 dust2 map, the designer's signature logo was found in the underground where ct was born and in the mountain area B, but you have to observe the pattern after death or a third party to see it!