Yes, these refer to pre-qualification letter and verification of funds. As mentioned earlier, these are valuable tools in determining what you can afford and getting your purchase offers taken seriously. It is always smart to have your funding in place prior to looking at properties. You would hate to lose your dream home to someone that has their funding in place and can move faster than you on the purchase.
Be aware that a mortgage pre-approval letter is required in order to determine your price range and for any offers to be taken seriously; therefore if purchasing with a mortgage, they would like a mortgage pre-approval to accompany one's offer; or if paying in cash, a bank letter stating proof of funds is required with offer.