In addition to the possibility of using a Word or Google document as a “parking lot” for managing questions in your web-delivered demonstrations, another elegant option is to use the Chat dialog in Zoom. Chat has the added advantage that the customer can type the question (or add clarifying info) as well! Chat is saved automatically at the close of the session (assuming current Zoom default settings).
You can use Chat in WebEx and GoToMeeting as well, but you may need to proactively save it yourself – I’m not certain if the current settings in these tools automatically save your Chat dialog. Does anyone know?