Help! (Ada/Integrity/PEG)

["TAMS Team" <tamsteam@rolls-royce-rps.demon.co.uk>]

We're just about to start our project using Integrity/AdaMulti to code the
main part of the application, with PEG as our GUI designer.  The target
hardware will be a Radstone PPC4 board.  The (Ada) application will decode
serial data coming from a remote processor to generate the screen layouts
and softkeys (and changes to their properties, e.g. text contents), and
encode serial data to send back to the remote processor which will
essentially only contain information about softkey presses and status flags
from the screen hardware.  All the PEG task is required to do is to display
the appropriate windows or softkeys.

Our first hurdle to overcome is how to get the main application task talking
to the GUI task.  We're not quite sure how to get started, but I think we've
convinced ourselves we may have to use some form of messaging.  However,
we're not certain of the form of messaging - i.e. typically how do you send
a message to the RTOS message queue, what form is it, and how does PEG pull
it from the queue?

Any advice (or even sample code!) greatly received!

(Please assume we're complete novices with absolutely no experience using
this combination of products, and you'll be pretty close to the truth!)