I don't like legalese, so here I'll give a history of hey & it's various authors
(as far as I've traced it back, that is; if anyone can fill me in on anything 
I'm missing let me know). 

The first version I know of was written in Perl by Adrian Colley, at TCD. I 
know nothing more about him, except that he was a friend of Paul McGaley, who 
took over it next. Later, in DCU, another version was written by Adam Kelly, 
Colin Whittaker & David Madden. At this point, it was noticed that many a perl 
interpreter had to start for people to send heys back and forth, and so I 
figured it was worth a rewrite in C. c-hey's options and environment variables 
are taken from the Adam & Co. version.

Readline support was added by Robert Crosbie <bobb@redbrick.dcu.ie>.

Support for heying from a mesg n terminal was added by Colm Mac Cárthaigh 
<colmmacc@redbrick.dcu.ie>.

So there you go. If you like hey, let me know where you're using it so that I 
can massage my ego. Thanks, 

Cian <pooka@redbrick.dcu.ie>