The process is most used to describe OS processes. However, some questions tagged process relate to software engineering process models and methodologies and some others are "how to do X" questions (such as "Benefits of stripping trailing whitespace?". In a perfect world, these software engineering process questions would be somewhere else (shameless plug), but that place doesn't exist yet. In the mean time, the process tag should be removed from every post where it does not refer to a system process.
It looks like the only way to do this is to manually go through everything tagged process...
EDIT: Just wondering if anyone else had any feedback before I jumped in and started retagging everything tagged [process]. Retagging will affect nearly 1300 questions, so we better be sure of what we want to do before we do it.