My company frequently has meetings and video chats, and we are currently looking into the possibility of hosting a conference from an iPad while using some other apps. This is mainly due to the fact that we want to use the annotate feature in things like PDF files to make notes and highlights for the whole group to see. The main two issues here are that we want something multiple types of devices (Macs, PCs, iPhones) can connect to, as well as something that can run in the background while the host opens up other apps, while still showing their screen and voice to everyone. Does such an app exist?