In Tutoom you can stop the recording to show only what's been captured before you pressed the button.

You will find the Record button located inside the presentation area.

To activate it, click the button and it will turn red.

To deactivate it, click on the button and it will turn gray.

All moderators will be able to turn it on or off.
Each time you turn it on and off, a new video will be created.
At the end of the session the video will be created in the location previously specified by the administrator.