[ic] problem regarding interchange

[Vinod Kumar]

whenever  i submit the checkout form it is giving me an error of [subject] .
what is the reason of this error .

in the action of checkout.html file [process] is specified .what is this 
[process] all about .

Which file is storing the information about the products ordered .i need 
this information for storing it in database .

How can i customize the checkout form . i want to add some more fields in 
the form .

please help me in sorting out these problems
regards

Vinod kumar