1. A first device, comprising: at least one computer display, the first device being a mobile communication device (MCD); at least one computer memory comprising instructions executable by at least one processor of the MCD to: receive a user command; responsive to the user command, trigger an on-screen-display (OSD) to be presented on a second device, the second device being a primary display device (PDD) adapted to present first content; search for second content related to but different from the first content; present the second content on the MCD, the second content being ancillary content to the first content; present at least one first user interface (UI) on the MCD including a listing of one or more pieces of second content that have been located during the search, second content denoted by respective selector elements in the listing being selectable to automatically without further user input cause the MCD to begin presenting the second content associated with a selected element from the listing, the first UI also including a device selection section including a prompt for a user to select one or more of the selector elements in the listing, the first UI also including a fling selector element selectable to cause the MCD to, responsive to a fling command or gesture, second content selected from the listing to a target device such that the second content automatically without further user input is presented on the target device; wherein when the target device is the PDD, the PDD presents the first content simultaneously with presenting second content in a second UI, the second UI including functionality to cause the PDD to cease presenting the second content, the second UI including functionality to present a listing from which another second content can be selected for presentation; the instructions being further executable to present: a prompt for whether the MCD should automatically without user input be selected as a companion screen device to the PDD such that the MCD can be configured to automatically present second content based on detection of first content being presented on another device.