A companion advertisement is displayed on a control client which is also used to control the content being shown on a display client. The companion advertisement is related to a video or advertisement being displayed on the display client. Such a companion advertisement takes advantage of previously unused screen real estate and enables the user to interact with the advertisement or view further information without any interruption of the content being displayed on the display client. A server keeps the content displayed on the display client and control client synchronized. The server recognizes when a user is logged into both a display client and a control client and notifies the control client that an advertisement should be displayed. The control client then retrieves an advertisement related to the content on the display client.