osx man page for dpd

dpd(8)							    BSD System Manager's Manual 						    dpd(8)

NAME
     dpd -- Display Port daemon.

SYNOPSIS
     dpd

DESCRIPTION
     The dpd executable is a daemon intended to listen for Command + F2 on the iMac to switch to external display input mode upon display port
     hot-plug. This feature is known as Target Display Mode. It disables display and idle sleep while in external display mode and launches an
     audio tool called dpaudiothru to capture audio input and route it into the mac unit. To go back to normal mac mode, unplug the display port
     or press Command + F2 again, which will restore all settings.

     dpd should only be run via launchd.

FILES
     /usr/libexec/dpd					The daemon
     /System/Library/LaunchDaemons/com.apple.dpd.plist	The launchd configuration plist

Darwin								 February 18, 2009							    Darwin