Back and front shoulder st/bind off..?

I have a vest pattern that I’m almost done whit,it is in 2 pieces front/back,when i come to the bind off it says to bind off the front and the back st together and then the middle st and then again the front/back st,does that mean that i have the front/back st on 2 needles and knit them like k2 together?

Similar yes. It Sounds like the Three Needle Bind-off, shown here. Bottom of page.
http://www.knittinghelp.com/videos/casting-off

thank you,i get it now!