As on the unix server to track the PC which disguises your user-agent for mobile devices?
the question is not about layout. this intelligence traffic inbound. on what parameters we can understand that it's a PC, not a physical mobile device?
2 answers
For a digital "snapshot" can be distinguished. For a start, to consider all as PC, but those who then provided the correct cast - as mobile devices.
"user-agent" is just a string - it anything can be faked. And the cast is the result of the JS on the client side - there is already more difficult to forge.
Mobile is when onhover is missing :)
Mobile(useragent)+onhover = THIS is IT!!!
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