Seahawk's interface: tabs, hyperlinks and nested popup menus. In the compact tabbed Web-browser interface of Seahawk, navigation and other browser functions are found at the bottom of the screen, and hyperlinks abound in the document. Left: The 28 results of the getSHound3DNeighboursFromGi service invocation from Figure 2. The pop-up menu appears after clicking one of the NCBI_gi hyperlinks, and presents services that take an object in the NCBI_gi namespace as input. Right: Results of the Genbank record retrieval service for the selected NCBI gi number. Note that service hyperlinks appear for crossreference and sequence subcomponents of the composite object AminoAcidSequence.