Update 1.082 has introduced a new field for Programmable Block: https://github.com/KeenSoftwareHouse/SpaceEngineers/search?utf8=%E2%9C%93&q=TerminalRunArgument
This would be the ideal mechanism for exchanging messages between programmable blocks, rather than changing the name of a programmable block as is currently done.
I haven't used the EasyAPI messaging feature so no pull-request from me at this stage. Just flagging this as a neat thing TODO.