the non-GUI practice of interacting with a program by submitting PlainText to it, and getting PlainText output
often associated with UNIX culture, or MsDos as precursor to MsWindows
some newer things sometimes called a Command Line:
Jabber (and other Instant Messaging)
Web Browser Location field
Web Services (a stretch, but the focus on PlainText makes a point - it's a PipeLine-friendly model)
Can be good way to launch Mac Ro or Scripting Language.
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