override setting, in file +control-extra.dat+, whilst also showing
current usage measure from file +usage.dat+.
+The server +hourglass-web+ is first installed with
+----
+$ ./hourglass-web install
+----
+That installation sets up a small +www+ sub directory with "CGI"
+scripting to provide the Hourglass User Interface on port 1070.
+
Hourglass Network Traffic Capture
---------------------------------