Buy House

How can I buy a foreclosed house without using any money?
I got this letter from mail to attend a seminar in my town on how to buy houses without money.
No money down usually means:
1. using other people’s money
2. Seller financing
3. rent to own
4. Using 401k
5. using assignable purchase option contracts
6. 100% financing
7. etc…
Just pick up some books at your local bookstore on real estate investing.
Regards