IELowUtil.exe is the broker process that handles operations which require processing at a Low Integrity level.

IE 8 takes advantages of two new APIs for getting and settings cookies that can be shared across integrity levels:

IEGetProtectedModeCookie IESetProtectedModeCookie

The above functions call the standard InternetGetCookie() and InternetSetCookieEx() functions from a higher-integrity user context to retrieve or create a cookie with a specified name that is associated with a specified URL. The signature and behavior of these two APIs will match the winINET APIs:

InternetGetCookieEx InternetSetCookieEx