Compex Systems 802.11N - Manual (Page 44)

Virtual Access Point (VAP)
Virtual AP (VAP) implements mSSID (Multi-SSID) whereby a single wireless card can be setup
with up to 3 virtual SSID of BSSID connections. Each VAP can be set with different security
authentication mode.
Fig 2.11 Virtual AP (Only Available in Access Point/ Access Point WDS Mode)
All VAPs are created from the same radio they all share the same wireless channel, country code,
channel spectrum width and transmit power.