While a user interacts with a networked host application such as creating or editing documents, the user is enabled to invoke (or otherwise act on) a partner-selection user interface presentation to explore available partner services for carrying out a desired partner function that is complementary to the host application functionality. The user is further enabled to select one of the partner services listed in the partner-selection user interface presentation, in response which, the host application automatically instructs the partner service to perform the desired partner function complementing the host functions performed by the host application in an integrated and seamless manner.