trackball/mouse interface

[csc at riccb.UUCP]

i`m looking for some information on interfacing a trackball
(dedicated to a tty port) that will write to a dedicated terminal
port.  i want to use this for data input from application
programs i`ve written with curses.  

how do i get the mouse tty structure to point to the structure of 
my shell process?  i was hoping to just fork this program off in
my .profile and have it open my tty for writing and it will take
care of updating the tty structure with the current row/col info.
but i'm not sure how to have it update another tty structure.
Xenix SYS III (which i'm using) has a t_chan in the tty structure
which appears to be meant for this. any help is appreciated 
if enough interest is generated i will summarize asap.