Emergency holographic program

An emergency holographic program was a hologram designed to fill a particular function aboard a starship or space station in the event of an emergency. These programs were not meant to be used continuously and originally required a crewmember to activate them, though later programs were able to active themselves if the computer detected an emergency. (; )
These holographic programs were introduced by Doctor Lewis Zimmerman.
File:Lewis Zimmerman, 2373.jpg|Doctor Lewis Zimmerman, considered the father of modern holography.
File:EMH replacement program.jpg|USS Voyager's EMH, The Doctor.
File:Mister Hospitality.png|Mister Hospitality, La Sirena's EHH.