TTY?

[Max Jonborn]

Hi!
 
Got a quick question. When i input "radwho", i get this output..
 
Login      Name              What  TTY  When      From      Location
userlogin   username      PPP   S12  Thu 11:21 127.0.0.1 XXX.XXX.XXX.XXX

What does the TTY mean? What kind of TTY is radius using? Is there a
limit to how many TTYs i can have?
 
Cheers!
//Max
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