[OpenMap Users] Lan Lon of upper left corner

Hi, I am trying to display SHAPE map in a servlet with openmap.
Here is my question:

1) I would like to know the lan and lon of the location in the map image when a
user clicks his mouse on the map, how can I do this?

2) Actually, I know that I can get the mouse position on the image by http, but
how can I translate the position of mouse on the image to the actual lan and
lon?

I think I know the mathematics to calculate the real lat and lon provided that I
know the upper left corn's lan and lon. How can I get those 2 values?

3) Also, I am using MapRequesHandler to produce the map upon request. How can I
add a layer which shows the .dbf content of the map?

Thank you for your kind attention and help!

Steve

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