Standard net tools are a few irrevocable abilities that each Netizen has access to by design - things a server cannot override:
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either blocking or receiving private messages one is the recipient of
either blocking or receiving global messages one is the recipient of
sending private messages (as long as the recipient has not blocked them)
defining one's sensory input limits
disconnecting from one's sensory inputs (either individually or in full)
respawning on avatar death (generally automatic)
pausing oneself for a certain amount of time or running at a slower pace than normal
(Denizen-only)
logging out entirely
(Citizen-only)
Entrapment is in part as scary as it is since it not only affects web access control but also the supposedly irrevocable Netizen-bound privileges.