O

objectionable and offensive content. See parental controls

one-way hash functions, 34

Opera browser, 87

Options settings in Windows Defender, 173

ORDB service, 199

out-of-office replies, 187

outbound connections, blocking, 119-121, 119-120

outbound filtering by firewalls, 109

Outbound security tests, 129

Overview screen, 117, 118, 123