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In the Star Trek fictional universe, the Emergency Medical Hologram or EMH (full name: EMH Program...

In the Star Trek fictional universe, the Emergency Medical Hologram or EMH (full name: EMH Program AK-1 Diagnostic and Surgical Subroutine Omega-323) is a holographic program intended to support and augment medical personnel aboard a Starfleet vessel or installation in case of emergency. The EMH was introduced and is most commonly seen on the series Star Trek: Voyager, as played by Robert Picardo. The producers based the idea on the hologram character Moriarty, who achieved self-awareness in The Next Generation, and considered introducing the concept of the EMH in a seventh-season episode of Star Trek: The Next Generation, but this was not followed up. The program also made appearances on Star Trek: Deep Space Nine and the movie Star Trek: First Contact. It should be noted the kind of holograms used in "Star Trek" in general and the EMH system in particular are "solid", and not mere three dimensional images (see: Holodeck for a more in-depth explanation of the technologies used to achieve this). The holographic personification of the EMH program can therefore manipulate objects and perform surgery just like a real doctor. The limitation however is that the EMH can only operate in