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Hi, In PROOF we realized that we need a possibility to query exact locations of a set of files. As far as I have seen in the xrootd protocol, there is no way to ask for locations of a vector of files. At the beginning of a query, we want to check exact locations of all the files form a data set. The current implementation does it by opening all the files, one by one. The speed is about 30 files/sec. For many queries, the lookup takes much longer than the processing. It is a critical problem for us. The bool XrdClientAdmin::SysStatX(const char *paths_list, kXR_char *binInfo) method can check multiple files but it only verifies whether the files exist. I imagine that it would be best for us to have something similar but returning file locations. Is such an extension to the protocol possible/reasonable to implement? Cheers, Jan