Roku M1000 Software Manual page 132

device to search for.) The search term "urn:<theURN>" will search for devices
that match the type specified by the urn term. See the example above for the
expected format of this term.
NOTE: Only devices are currently searchable via the "urn:" specifier currently,
although the UPnP spec allows searching for services as well.
IMPORTANT: While the UPnPSearch command is transacting, it behaves
somewhat like a subscription command because it outputs search results as
soon as they are received from the network. Importantly, these search results do
NOT constitute list results, so they will not replace any existing RCP session list
results. Also, it is important to note that UPnP search results are currently
shared among all RCP sessions on an RCP host, so it is best to use the search
results soon after generating them.
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