Displays a message either in their chat, console, or center of the screen. See also PrintMessage.
When called serverside, this uses the archaic user message system (the umsg) and hence is limited to ≈250 characters.
HUD_PRINTCENTERwill not work when this is called clientside.
Prints into the first players chat: "I'm new here."
Entity( 1 ):PrintMessage( HUD_PRINTTALK, "I'm new here." )
Output: I'm new here.