[mapserver-dev] help:create maps on the fly without having a map file

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Hi everyone,
I have found a paragraph in a book named <Web Mapping Illustrated-p>,as fllowing:
"MapServer map files are still a key component to writing a MapScript-based application. If you have a map file ready to use, you can start accessing and manipulating it right away. However, a powerful feature of MapScript is the ability to create maps on the fly without having a map file. In this case, you can build your map from scratch".
I donot understand that we can create maps on the fly without having a map file.Is mapserver can really work without mapfile,especially in the environment via PHP/MapScript or Python /MapScript ?
Best Regards,
Rui jx
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