1. I recommend people to start with simple batch files, to get the general concept of the install down, instead of diving into WPI or the like. Simply so they can learn how the installer works, and when and where they can install things. The Unattended Guide also recommends this. To be honest, there isn't any benefit, but it's easier for people to grasp the concept of files on the harddrive, then visualizing where their files will beon the CD and changing their paths accordingly. 2. If you look through the beginning of most of the batch scripts you've seen, there are IF EXIST lines that search the drive for an ident file (typically WIN51) and then assigns the drive letter to the variable.