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In the simplest case , the GIOP reply message has just returned from the server to the local client address space where the callback also is , and so to get the repository id of the system exception out of the GIOP message would require parsing of it twice anyway . When contacting a Plan 9 file server we map all numeric ids to the numeric id of the mounting user . The metadata will only have to provide the persistent ID of the object , the user interface will request one of the two web_default methods for display , as appropriate to the context .