1. A method of operating a virtual universe system on a plurality of networked data processors to provide a service, said method comprising configuring at least one data processor of said plurality of data processors to provide attributes of an environment and objects and/or avatars therein from which a representation of that environment, objects and/or avatars can be established in said virtual universe and rendered for display to a user; an alert detector to detect an event in said virtual universe system; a resource table for indicating portions of said environment related to said event; one or more lists of tasks corresponding to locations based on portions of said environment indicated to be related to said event by said resource table; priority logic for prioritizing entries in said lists forming a stack of prioritized locations and associated tasks at respective said locations in accordance with said event; and a stack output to output contents of said stack, in order, as teleportation invitations.