Send data between mdichilds

Hi,

I have a MainPanelForm which servs as a MDI Parent form.

I have  scenario in c#
When I am clicking the Orders it open the orders. On the Orders Form I have a OrderDetails button which opens the NewOrders Form where I can view the order and the details.
What I want this OrderDetails button to do is, open the NewOrdersForm with the same OrderID I selected in the Orders Form and its details.when I click any record on NewOrdersForm,
Again I have to send back the   details from NewOrdersform  to Order form.

Thanks

Ram