Blank *Host* Monitor feature for the Guest Client

Let's say the Guest is entering his or her credit card details, social security number, or anything else the Guest may find sensitive. In such cases, the Guest would probably appreciate having the ability to blank the Host's monitor (well, the Host Client window, to be precise—don't need to blank the entire monitor!) or else pause the connection (because, currently, the Guest only has the ability to end the session).