===== ScratchPlugin =====

http://info.scratch.mit.edu/Source_Code

We are going to use "ScratchPlugin" Object for coverage of the ports
and some convenience.
ScratchPlugin may require a real port name e. g. "COM1"
Please check how to get port names in Mac (or even Linux) machine
referring "Scratch".
And I want to ask you to propose us to how to share developing codes
on the Squeak.