From Elendor
enter <object>
Used to enter a thing or player. You can only enter an object if
you own it or if it is set ENTER_OK. You must also pass the enter-lock,
if it is set. Entering an object triggers is @enter/@oenter/@oxenter
messages and its @aenter actions. If you fail the enter-lock, the
object's @efail/@oefail/@aefail messages and actions are triggered.
Insides of objects are best used for vehicles, or storage spaces
when you don't have a home. You can describe the interior of an
object differently from its exterior by using @idescribe.
See: @enter, @oenter, @oxenter, @aenter, leave, @lock, @idesc, INTERIORS