User Interface Privilege Isolation
In earlier versions of Windows, processes running under the same user account shared the same basic security privileges. Starting with Windows Vista, a new attribute, Privilege Level, is attached to each process. A process cannot send a message to another process with a higher privilege level, although they both may be running under the same user account. <br />This unit introduces you to UIPI; and shows you how to detect and workaround issues and related to UIPI.