V

versions of Windows Server 2003, 138

virtual memory, 269

virtual private network (VPN), 138, 224

viruses, 334-337, 382

VirusScan (McAfee), 336

Visio (Microsoft), 72-73

VoIP (Voice over IP)

advantages of, 219

Analog Telephone Adapter (ATA), 218-220

AT&T CallVantage VoIP services, 218

cost of, 219

defined, 217

disadvantages of, 220

features, 219

how it works, 217-218

Skype, 218

software-only VoIP systems, 218

Vonage VoIP services, 218

VoIP For Dummies (Kelly), 217

Vonage VoIP services, 218

VPN (virtual private network), 138, 224