How to program WPI for an application install:

Run WPI.exe and select the Config button. You will now be redirected to the Config Wizard.

Now follow these simple steps.
I am going to assume you have downloaded the applications install package and placed it in the install folder.
#1 Enter the programs name here.
#2 Choose your install order.
#3 You will see that the UID (Unique Identifier) has been automatically filled in for you. Important for advanced uses!
#4 Enter the programs installer location here. You can use most system variables to simplify the process.
#5 To automate the programs installation you need to enter the proper switch for the program here.
#6 If desired you can place a picture to be displayed in the tooltip in the Graphics folder and place only the name and extension here.

Now click on the "Save" or "Add New" buttons on the bottom. (Depending on if you want to add another app.)

To find the switch(s) for the most common apps you can use the Universal Silent Switch Finder from HERE.
To use USSF simply place it on the same drive as the applications installation package and browse to it with USSF.

For those applications that are much more complex please search the application installs forum of MSFN:
Application Installs Forum Section!

Supported environment variables for the config section:
%cdrom%
%systemdrive%
%windir%
%programfiles%
%sysdir%
%allusersprofile%
%userprofile%
%appdata%
%commonprogramfiles%