"three fine silken Threads of six Inches long One is Blue, the other Red, and the third Green" (I: 3;4); see prizes
Groups of messages in a newsgroup concerning the same topic, including the initial posting, follow-up postings, and follow-ups to follow-ups
A group of e-mail messages that are all responding to one original e-mail message
An independent flow of control within a process, consisting of a context (including register set and a program counter) and a sequence of instructions to execute
Where an operating system can truly multitask, executing many sub-program units concurrently, having a path of execution within a process with very few resources as opposed to processes 8 2, p131