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In the Star Trek: Voyager episode, "Future's End, Part II", Voyager's EMH, the Doctor, was able to leave sickbay or the holodeck and roam freely with the help of a mobile emitter (the technology originating in the 29th century). Could this be used by any hologram created on the holodeck?

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  • I hope so! Let’s get that Irish bartender wandering around, occasionally making longing looks at Janeway in the cafeteria. Commented Oct 28, 2021 at 7:45
  • Oh, wait, they did that Commented Oct 28, 2021 at 7:47
  • I'm thinking my very own holographic coffee cup. I suppose you could stick a butler onto the coffee cup too.
    – DKNguyen
    Commented Oct 28, 2021 at 13:31

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The mobile emitter was evidently compatible with other holodeck characters, as it enabled the USS Voyager's Leonardo da Vinci hologram to walk around on a planet's surface, far from any other holoemitters, in the Voyager Season 4 episode, "Concerning Flight".

The mobile emitter also proved compatible with the USS Equinox's EMH (VOY: "Equinox"), the Michael Sullivan hologram (VOY: "Spirit Folk"), the Reginald Barclay hologram (VOY: "Inside Man"), and Iden, a hologram created by the Hirogen, using Starfleet holographic technology (VOY: "Flesh and Blood").

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    Not recalling those other instances but a notable distinction is the EMH program can self activate and shutdown the hologram. The nonplayer character holograms in theory should not have the ability, knowledge, or desire to prefer an emitter or prefer to be activated. Commented Oct 27, 2021 at 22:13
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    And presumably a mere character should be a vastly smaller program vs something as sophisticated as an EMH regardless of the sentient vs non-sentient issues. Commented Oct 27, 2021 at 23:14
  • Also Marayna (a holographic character controlled by an alien) was able to briefly use the emitter in Alter Ego, to visit Tuvok in his quarters after her program was "deleted".
    – Brandin
    Commented Jul 25, 2022 at 13:42

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