1. A method comprising: determining whether a user-interface command item associated with a user-interface control object is enabled, wherein said control object is configured to reside on one of a plurality of computing devices; if the user-interface command item is enabled, indicating to a user that the user-interface command item can be selected to initiate a particular command to which the user-interface command item is associated; in response to selection of the user-interface command item, routing the particular command from a calling entity to a particular destination for execution, based on whether the calling entity is an applet-level entity or an application-level entity; and executing the particular command.