1.If there is ever a reference to a page whose valid-invalid bit is invalid, first reference will trap to page fault.

2.OS looks at another table to decide:

If Invalid reference,the reference abort.

If just not in memory,go to step3.

3.Get empty frame.

4.Swap page into frame.

5.Reset tables, validation bit = 1.

6.Restart instruction: Least Recently Used

block move

auto increment/decrement location