I wanted to just print addresses on a 9.4 X 4 envelope. Following the "help" on Open Office I selected <insert> then <envelope>. Every thing went fine except that when I told it to print, it first printed an 8.5 X 11 blank paper. This was kind of awkward because I had to change from plain paper to the envelope after the blank page had printed. I could not find any way to specify printing just the envelope.
I don't know if this is relative, but my printer is an HP OfficeJet 3830.