Where you put lusers so they can't hurt anything. A program that limits a luser to a carefully restricted subset of the capabilities of the host system (for example, the "rsh" utility on USG Unix). Note that this is different from an iron box because it is overt and not aimed at enforcing security so much as protecting others (and the luser) from the consequences of the luser's boundless naivet'e (see naive). Also "padded cell environment".

[Jargon File]