how to symlink in win 7 (to share datastore between 2 different game folders)

[Ughmahedhurtz]

I don't think using the same datastore will work as the AH/bank addons only report things on the characters on the same account (and not even that in some cases). Note that if you do this, you can link (junction is the correct name in the context of mklink) the WoW\DATA\ and WoW\Interface\ folders and additionally all of the executables in the main folder (.exe, .dll, .manifest, etc.) and you will only need to update your main account once. That's what I did on mine and it worked very well and made updating a painless process.

C:\Users\xxx>mklink
Creates a symbolic link.

MKLINK [[/D] | [/H] | [/J]] Link Target

        /D      Creates a directory symbolic link.  Default is a file
                symbolic link.
        /H      Creates a hard link instead of a symbolic link.
        /J      Creates a Directory Junction.
        Link    specifies the new symbolic link name.
        Target  specifies the path (relative or absolute) that the new link
                refers to.

C:\Users\xxx>

[edit] If you decide to link the executables, those need to be hard links, not symbolic ones.