Practice beforehand to see what Chat or the Whiteboard look like. Bringing up the Chat window or the Whiteboard in a meeting disrupts everyone because these windows open on all the participants computers at once. If you must use chat to communicate with someone during the meeting, use the whisper feature to minimize the disruption to other participants. Avoid sharing an application while somebody else is trying to present something to the entire meeting. This can cause significant network delays for the host, who is trying to share an application or give a presentation.
Any participant can share an application .
B can share PowerPoint during the same meeting. However, for best results, it is recommended that you only share one application at a time, especially if there are multiple participants in the meeting. When sharing an application, don't collaborate unless you want others in the meeting to be able to take control of that application. This is the preferred mode if you giving a presentation and don't need others to make changes in the application. In other words, share the application, but don't collaborate unless others' input is required.