You can force ALTUI to open directly on a specific page by adding "&home=xxxx" on the url where xx is one of these keywords:
pageHome , pageRooms , pageDevices , pageScenes , pageSceneEdit , pagePlugins , pageUsePages , pageEditPages , pageCredits , pageLuaTest , pageLuaStart , pageOptions , pageEditor , pageZwave , pageLocalization , pagePower , pageChildren , pageRoutes , pageQuality , pageTblDevices , pageOsCommand
example
http://192.168.1.16/port_3480/data_request?id=lr_ALTUI_Handler&command=home&home=pageDevices