@idesc <object> = <message>
Function references and %-substitutions are allowed in inside descriptions, and are evaluated when someone fails to get or look at the object. In function references, 'me' refers to the object being looked at, while %-substitutions that refer to the enactor (such as %n, %#, %p, etc) refer to the player doing the looking.
This attribute is only meaningful for players and things, and will never be automatically triggered on other object types.
@idesc car = You are sitting in the driver's seat of a Volkswagen Beetle.