Names after options /p and /d are not the file names; they are script names, which is unaccessible outside PDW; If you want different options for some deployments, you can create separate scripts and run them in one or other situation (for example, two different install directories).

About log: for all i know, there are no return codes; rather than, all information about operation (success/errors) is stored in log file, which is plain text file; you can read this file and determine errors during the process. If this file does not exist, wizard creates them.

Refer MSDN article "Starting the Package and Deployment Wizard" for further information.