Clearing History And Files

Long story short there is a website i am using to place orders which launches a separate IE window, both of these only run in IE, but upon closing the orders site's window the temp files and cookies will not clear until every IE window has been closed and cleared manually, but this cannot happen as we need to keep our software open at all times.
The reason for this as when going to place a second order for someone else the browser is forcing me to have to keep the details of the previous order and cannot be cleared until clearing cookies etc and closing down every instance of IE

Is there anyway to get these files to clear when closing the orders website only?

Any help will be appreciated

Cheers
Cheech

 

Is there anyway i can set up a button that will carry out this action (EG - Clear now) withing the software my side of things, it is basically a web application so its just like editing any webpage.