Training melons and watermelons to grow vertically is referred to as trellising and is one of the advantages of growing melons in a high tunnel. Most melon cultivars and personal size (less than 7 pounds) watermelon cultivars are amenable to trellising.
A direct public offering (DPO), like the more traditional IPO, is a stock's introduction to the stock market. The stock is offered to the public for the first time. Unlike an IPO, which utilizes an underwriter to sell shares to the public, DPO shares are purchased directly from the issuing company.
One of the other benefits of purchase orders is your credit worthiness. Banks will often look at your PO's to determine if you are solvent. A solid purchase order process can help you get approved. A poor one will result in you not getting a loan. It can also be used for credit with the vendor.