Invisible Cast on - half-hitch cast on???

[pp2553]

I am starting a purse and the directions say to cast on using an invisible or half-hitch cast on--I saw the directions on the instructions for invisible but did not see the instructions for half-hitch--are they the same and what is the purpose. Thanks Patty

[Ingrid]

I've always thought that half-hitch was the same as backward loop. I don't know how invisible it is, but it doesn't create a stitch the way other cast-ons do.