The solitary function of the Gatehouse is to address demands of access to the Castle. These will, of course, be addressed on a case by case basis.
If you intend to join the Order, you should have already received letter on how to go about gaining access. If not, feel free to contact a member of the Order to gain more information on this subject.
If you are here as a visitor, please do make it known and indicate who you have been invited by so the proper permissions (keys) may be given.