Per a previous discussion here on Meta, I went through all questions tagged process. There were no questions about concurrency or IPC with this tag, so it was irrelevant, but I would recommend something along the lines of concurrency or inter-process-communication for these questions. I used the tag development-process to account for process model and methodology questions and simply removed the tag from "how do I do X" questions that didn't involve a formal process or concurrency issues.
I'm not sure how, but this tag is now dead to me.