>I Have A Class XYZ And I Have Derived A Form From it.In The Class Itself I Am receiving A parameter. Now If I want to receive One more other parameter to that specific or particular form what do I Do.??How Do I Accept Both The Parameters i.e The Class Parameter And Also A Diffrent Parameter To That Only Form.

I assume you are talking about receiving parameters in the init method. In your class' init method you have something like:
PARAMETERS tparameter1

In the form derived from the class you can add the parameter statement to its init method. Like:
PARAMETERS tparameter1, tparameter2

To call the original class init do:
DODEFAULT(tparameter1)

Richard