you can run from the same directory but it is better to have separate folders

you do not rename the wow.exe

Download Maximizer (search this forum to find the link.. .I can't access the site from work) copy maximizer to each of your wow folders.

Maximizer sets wow to run in a restricted region of the screen the syntax is

maximizer --margin=top,bottom,left,right

where top,bottom,left,right are the spaces to leave outside the region on each of its sides.

so create a .cmd file with something like the following

[code:1]c:\wow\maximiser --margin=0,600,0,0
c:\wow2\maximiser --margin=600,1,0,0
[/code:1]

this assumes that you are running 1600x1200 and it splits the screen horizontally

if you are on a widescreen monitor then you can go for a vertical split

[code:1]c:\wow\maximiser --margin=0,1,0,960
c:\wow2\maximiser --margin=0,1,960,0
[/code:1]

the 1 is there to leave room to get to the taskbar