[ih] Origin of 'talk' command

[Joe Touch]

Brian Dear wrote:
> Hi,
> 
> Does anyone know the date that the Unix "talk" command originally 
> appeared, and on what version/platform of Unix, and also if there's an 
> RFC on it (I've not been able to locate one)?

I would not expect an RFC: talk is between users on a single machine. 
RFCs tend to require inter-machine communication ;-)

I.e., this may be Unix history, but not quite Internet history (though 
given we don't get that much traffic, and there's some overlap in 
expertise, it seems OK to ask).

Joe