drive subsitution

[reet]

I need to know how to do a "drive subsitution" for a program. For my computers to share a photo file, the program recommends doing a drive subsitution in the autoexec.bat file. The program shows the following, but I am obviously missing something.

SUBST [drive1: [drive2:]path]
SUBST drive1: /D

drive1: Specifies a virtual drive to which you want to assign a path.

[drive2:]path Specifies a physical drive and path you want to assign to a virtual drive.

Let’s look at the following example…
SUBST P: C:
This command will allow you to create a new drive called P: that will contain the contents of the C: drive. You will then see a P: drive under “My Computer” that mimics the contents of the C drive. Both will look identical, but when pointing to images from within AA Pro, you should always point to the images on the P drive in this example. That way the database will store paths to the P drive and therefore the links will resolve on all clients.

So when I write the SUBST line, do I include the brackets? what is the "path" part? I just don't get it