Interacting with a computing device can include registering a plurality of commands from a plurality of applications, wherein the plurality of commands specify entity types that are accepted as parameters, determining a first entity having a first entity type, wherein the first entity is independent of the plurality of applications, and determining a selected command from the plurality of commands registered by the plurality of applications that accepts the first entity type as a parameter. The first entity and the selected command can be provided, using a processor, to a first application of the plurality of applications that supports the selected command for execution.