Virtual Advanced
（重定向自VBBS）
VBBS is an acronym for Virtual Bulletin Board System. It was a shareware bulletin board system (BBS) for DOS (and later OS/2) that was conceived by Roland De Graaf in 1990. Written from scratch in QuickBASIC, it developed a loyal following. Originally it was a door for WWIV, but quickly grew into an original BBS concept on its own. By 1993, there were thousands of computers running VBBS around the world. VirtualNET, the largest VBBS message network, had close to 1500 members by version 6.14 in 1993.