you mean simple double knitting? sorry but you're unventing it.
the process.. cast on even number (yes it can be done with odd numbers, but its easier to learn with even.
Row 1 (and every row)
*K1, bring yarn forward (as if to purl) slip one. bring yarn back (as to knit) and repeat from *
I've knit glove this way (starting with the finger tips, and knitting all 4 fingers, then joining fingers to make hand, and latter adding a pre knit thumb--(and now getting to hard part, decreased to make a thumb gusset.. and ended with a ribbed cuff.
I am a big fan of double knitting.. starting in LATE APRIL of 07, there is an 8 part tutorial on all sorts of double knitting on my blog..--including a link to a youtube video for a modified long tail cast on...
if you are on ravelry, you can see some of my double knit projects.. (hat, vest and a dozen +potholders)