Both 'Open orders' tab and 'Orders Archive' tab displays information about placed orders and their details. 

'Open Orders' displays all orders placed and their status in separate categories – conditional purchase, conditional redeem, SIP order, normal order. Each of these orders can be canceled or modified in this tab. 

Where as in 'Orders archive' tab every order is recorded. A search button is  included in Orders archive tab to find any order place through your account, there is also a status legend to help you understand the different status the an order takes towards completion