CapTP Descriptors:
Far3Desc

Far3Desc(searchPath  :String[],
         hostID      :VatID,
         nonce       :Nonce,
         swissHash   :SwissHash),
         vine        :Vine)

A Far reference encoded towards a foreign vat is decoded by looking up the nonce and swissHash in the host vat.

*** Doesn't work until the WormholeOp is implemented. Until then, use the Promise3Desc.