Is it possible to detect specific info of the device like mac address ?

[abdelwahebmoalla]

I was wondering if it's possible to add attribute like mac address or anything so I can identify if the user already connected with this device or is it a new one ?

[benzkji]

this probably wont come through (check for example: https://stackoverflow.com/questions/5074139/how-to-get-mac-address-of-client-using-php )