Command Line

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)
• Active Words
• 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. Or talk to a ChatBot or Intelligent Software Assistant.