Module Notes

The Module concept is for a generic mechanism to attach external
code to Alltalk.

A simple mechanism "Driver" was added for Mac programs. The
protocol is
	open	! Open a connection to the remote code
	write	! Write/read a message frame.

This mechanmism is adequate, but it does assume that: 
	1) Loading and starting the remote code is handled
	elsewhere.
	2) The remote code has some sort of periodic behavior
	that is generated by the system. The GetNextEvent cycle
	did this for the applications that were linked by Driver.

For the PC and other platforms there are new requirements:

	The external code must be loaded by one of the client
	applications. At load time, the code must be initialized.

	Other applications may want to use the code concurrently.

	The periodic behavior must be invoked by one of the client
	applications.
