door1: plain stick door
door2: user-locked gates (owner has exclusive edit/dig privs)
door3: password-locked gates (owner has exclusive edit/dig privs)
linkingbook/plinkingbook: name the book and teleport to locations without giving the coords away. plinkingbook only works for its owner. So you can set traps using the different books.
a powerful tool (digs fast, lasts forever), and like i said many decorative and even musical elements.
/givemes only. there are aliases at the eof for most of the nodes
screens: