Abstract: A presentation system provides a for an audience display and a mobile wireless device operates to reserve a portion of the display screen of the mobile wireless device that is not mirrored to the audience display allowing ancillary functions of the mobile wireless device to be accessible during a presentation without visibility to the audience. Image output data from these functions may be dragged into the portion of the display that is mirrored. Those ancillary functions may include presentation specific functions such as pointers, drawing program tools, keyboards and the like, or more generally other tasks executable on the mobile wireless device.