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We should avoid using threads as this has portability issues.
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The samp.hub.shutdown request allows a client to shutdown the VO Hub. This is not part of the SAMP protocol but does not harm. It is basically needed for unit testing.
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The file existence checking is not to be done in GUrlFile as this class may create a new file. The check needs to be done in GXml.
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The Hub is searched for when a client is initialised so that one can ping a Hub from a client.