Designing Kitchens and Bathrooms - Another question about "when durock meets green board

I know this has been answered but this is a slightly different question, here is what was said in a previous link

I plan the job so the tile will lip over the joint about an inch or so, caulk the joint to seal it, and tile over it. This insures the majority of the tile is on the concrete board and yet the edge lips over the sheet rock and provides a nice clean look.

we will be using a metal strip to butt the tiles up to on either side of the tub edges. We want the tiles to line up with the edge of the bath. Would we take an inch off the width of the durock so that this end tile would then cover the seam of both?
We have also never used the metal edging before so does it get screwed in or glued ?
thanks.

That's the way I do it. Others may disagree though. I make sure there is plenty of frame support behind the seam so each side can be securely fastened and won't "work" or move. I then fill the seam with caulk to seal out any moisture. This allows the tile to lip over the sheet rock a bit to provide a nice clean edge without having to deal with exposed thin set when all's said and done. I don't much like the look of the metal edges so I don't use them. I prefer some sort of tile trim if the tile I'm using doesn't come with bull nosed pieces to trim the edge out with. If you use the metal trim, it gets fastened to the wall with screws or nails to hold it in place untill the tile is applied which then embedds it into the thin set. I don't imagine it would hurt a thing to also put thin set between it and the wall to make sure it's part of the whole thing. Having never used it, I'm sorta flyin' blind on that one.

Not sure what you are talking about with the "metal strips".

Might this be it?
http://www.schluter.com/english/products/2002/sectionb/overview-b/section-b.html

All joints where two sheets of durock or durock and sheetrock meet should be taped. End the durock giving yourself enough room for tape and mud (thinset). The tile will cover this joint fully.

I've used the outside corner strip once, but it was because we couldn't find any bullnose trim tiles in the design, and it helped dress up the corner. Otherwise I don't use them. I prefer the clean look the bullnose gives.

Not sure what you are talking about with the "metal strips".

Might this be it?
http://www.schluter.com/english/products/2002/sectionb/overview-b/section-b.html

All joints where two sheets of durock or durock and sheetrock meet should be taped. End the durock giving yourself enough room for tape and mud (thinset). The tile will cover this joint fully.

Yes the metal strip looks like the schuler product. We will not be using it on a corner however. It will be on flat walls, starting at the ceiling and stopping at the edge of the bath tub. I see they say to embed it in DRY-SET MORTAR. Is Dry-set different from thinset mortar?