Audit options can not be turned off

[Queyon]

In Oracle 9.2.0.6, I turned on many audit options and turned them off with NOAUDIT command. Eventually, some of the audit options cannot be turned off:
USER_NAME PROXY_NAME AUDIT_OPTION SUCCESS FAILURE
---------------- ------------------------------ ---------------------------------------- ---------- ----------
ANY CLIENT SELECT ANY TABLE BY ACCESS BY ACCESS
ANY CLIENT INSERT ANY TABLE BY ACCESS BY ACCESS
ANY CLIENT DELETE ANY TABLE BY ACCESS BY ACCESS

What does "ANY CLIENT" mean? How to turn these audit options off?

[dbasan]

Unset the AUDIT_TRAIL in the init file.

[Queyon]

Unset the AUDIT_TRAIL in the init file.

So what if I need to turn them on again?
Nobody likes restarting the database all the time.

[dbasan]

You should READ this.