[Socket] Is there a way to recognize a client by their device?

[SheeppOSU]

I'm using socket to make a type of online game, so I plan to make a login system. Is there a way to recognize a device that has logged in before, for example: I log in, exit out of the game, and when I reopen the game it recognizes my device and uses the login info that I'd previously used to login automatically. Thanks in advance for any help.