Press Ctrl+D, the One Click Bookings page appears in the top-right corner of the screen. The mouse cursor will change to 1-DNB,
indicating that if you double click on available time slot, it will become reserved.
Hold Ctrl key to reserve the entire day.
It is possible to use DNB for reminders.
Anything that you enter in the 'To do' box which is located on the
page will also appear inside of DNB box.