Due to the caching used by most browsers, you will probably need to hit the
reload button each time you view the graph. The image is sent with the
appropriate headers to ensure that your browser will no cache the
picture but some browsers tend to ignore these headers and cache the
image anyway.
Overview : W3-mSQL and mod_graph demonstration
This example provides an interactive demonstration of the HTG Graphing
Module (mod_graph) for Lite and W3-mSQL. A data entry page allows you
to adjust various features of the graph, including the data being
plotted and also the appearance of the graph.