In his Traveller novel _Agent of the Imperium_, Marc Miller illustrated the
personality wafer as technology that was available even in the early days
of the Third Imperium. In the novel, the wafer personality 'took over' the
waferjacked person completely, and lasted for 30 [standard] days.

James White, in his Sector General series, described 'educator tapes'; a
doctor could "take" one of these, and have the entire knowledge of a doctor
of another species available to him, but it didn't override the host's
consciousness completely the way that the wafers in _Agent of the Imperium_
did. Additionally, once "taken", the effect of the tape was permanent,
unless specifically erased. Doctors with sufficient experience and of
appropriate psychological stability could "take" multiple tapes
simultaneously, and be able to operate on any of the species whose doctors
donated the tapes. A doctor "carrying" tapes could also draw on the
knowledge available to come up with hypotheses about (and possibly
treatments and surgical procedures for) unknown species with similarities
to the tape donors. It was not clear from White's stories whether a doctor
carrying a tape from a given species could remember anything about that
species when/if the tape was erased from his mind, but given that Senior
Physicians and Diagnosticians had research and teaching as part of their
duties, it's not unreasonable to hypothesize that they might remember some
particularly important details that they had to deal with during an
other-species operation.

It's not clearly stated anywhere I can find, but if Traveller wafer tech
becomes 'better' over time, and allows both the wafer personality and the
host personality to co-exist for the duration of the wafer activation, then
it becomes possible for 'Sector General Junior' to exist in the Traveller
universe: On worlds that have a high likelihood of other-species visitors,
hospitals at major business and tourism nexi would have wafers "on file"
for the most common other-species - for example, Vegans in the Solomani
Rim, Vargr along the coreward frontier, Aslan in the rim-spinward areas and
Behind the Claw, and any minor races in the areas near their respective
homeworlds. Naturally, any nexus worlds that are majority-nonhuman would
also have human wafers on file. In this case, the wafer personality could
be either "for the duration" (i.e., until specifically removed/erased) or
for a limited time.

Hospitals that have a wafer bank are also likely to be teaching and
research hospitals affiliated with major Imperial-level universities. While
the various Imperial services are likely to make units single-species, some
medical facilities such as Naval hospital ships and hospitals at major
Naval and military bases will also have wafer banks.

Question for discussion/comment: Is it worthwhile and useful to work up
rules for determining whether a particular world has one or more hospitals
that have wafer banks to allow them to serve "aliens"?

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