another question about ptys

[Warren Burstein]

Can anyone explain to me the interaction of tty modes with ptys?
How are the modes initially established?  If I write the intr char
to a master pty, does this cause a SIGINT?  If I turn on echo will anything
I send down the master come right back?  Can tty modes be established
on both sides, or just on the slave?

Lastly, what document should I have read to find these answers?

thanks