The first time you use Phindows, you should set up the environment variables on your
            computer.
         
         
         
         Phindows
            uses the following environment variables:
         
         
         
         
            - SYSTEMROOT
- The location of the system-wide phindows.ini file, if any. WINDIR is used if
               SYSTEMROOT is not set. 
            
- HOMEDRIVE
- Used in conjunction with HOMEPATH to determine the location of the user-specific
               phindows.ini file. 
            
- DOUBLE_BUFFER_DELAY
- A delay value in milliseconds. Double buffering will not blit to update the main
               window more often than this. The default is 5. 
            
- PHINDOWS_CLOSE_PROMPT
- If this variable is set, a simple yes/no confirmation prompt is always presented
               to the user when he or she closes the Phindows window. The default action (i.e.
               without this variable set) is to present a more complicated prompt only if a new
               remote Photon session was started during this run. The contents of this variable
               determine the confirmation prompt text. Related environment variables
               PHINDOWS_YES_TEXT and PHINDOWS_NO_TEXT can be used to customize the Yes/No
               button text.