Response.Flush Method
IIS 6.0
The Flush method sends buffered output immediately. This method causes a run-time error if Response.Buffer has not been set to TRUE.
Flush( )
Client: Requires Windows XP Professional, Windows 2000 Professional, or Windows NT Workstation 4.0.
Server: Requires Windows Server 2003, Windows 2000 Server, or Windows NT Server 4.0.
Product: IIS