The PowerLite 99W supports a "Moderator Function" that Epson describes as:
"Multi-PC projection and Moderator function allows up to 50 devices to connect over a network and then select up to 4 to project simultaneously."
As illustrated below, this allows the teacher/moderator to select the content to be displayed from up to 4 devices (i.e., PCs, MACs or mobile devices), from a maximum of 50 connected devices.
Slide Shows without a computer
A flash drive can be plugged into the projector's USB connector to display photos, slideshows and videos without having an attached computer. The projector's remote includes the buttons needed to navigate through the photo slide show or video. This can be useful when the projector is being used as a portable unit for doing a quick setup for hassle-free presentations.