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Conspy allows a (possibly remote) user to see what is displayed on a Linux virtual console, and send keystrokes to it.
All available documentation can be read online at http://conspy.sourceforge.net/
Ponticulus (a virtual COM-port over TCP/IP redirector) allows synchronous connecting and disconnecting to a remote serial port (e.g. on an embedded device). It was initially based on com2tcp, part of the com0com project. (http://com0com.sourceforge.net/)