Cooperative Microcosm as an open hypermedia system, integrating technologies such as CSCW, information retrieval, version control, OODBMS, etc., creates an environment suitable for co-authoring. The context created by local keywords combined with global keywords and a thesaurus, can solve ambiguities which currently exist in normal query mechanisms. We are currently undertaking experiments to test whether the time saved by users in navigating without a clear destination, and in analysing the results of queries justifies the extra effort of providing keywords for nodes and source anchors. Further publication will summarise the results obtained.