ITEM PORTAL
Portals are neat things, you enter one, and you're transported elsewhere. You also need to set the portal specproc on the object.
v0 = Unused
v1 = Target room vnum
v2 = Unused
v3 = type of portal
Portal types:
0 = portal
1 = Book
2 = Game
See also: OEDIT, OSET, ITEM_TYPES