How do you clear history in CATIA?

If you are a regular user of CATIA V5 like I am then you may have run across this error: "operation cannot be completed because part is already in session. Please close the session to complete the operation." This error may occur because of a scenario like this:

I open a Product that contains Part A, Part B, and Part C. I open Part D, modify it, and close it. According to the Desk, Link, and