my own program

[Vishal Nagpal]

I have a mapserver installation running using openlayers library.
I wish to add my own functionality to it at the server end. Using the
information of the height layer. (feature info). How do i pass this info
from mapserver to my program and how should i display the output.
I saw an example of Mapserver where it calculated the shortest path between
two places. I wish to do something similar where do I add my algorithm and
calculations.
Regards,
Vishal