[ic] empty cart ???

[service]

Hello list?
i know that after transaction the order info is sended to database and
the cart is emptied. can please someone point me where that happens in
the code , i would like to unmodify that option and keep the order
informations. also i don't recieve any emails after orders are
processed, for both client and as a owner of catalog.
please help
thank you 
greg

running IC 5.2, RH Enterprice 3.