To start GLASS, run the glass.exe executable on Windows, or glass on Linux or
    MacOS.
    
    How to load a GSS spread sheet file:
    
    To load an existing GSS file, you may use the format.
    
    glass [file] [option]
    
    Example:
    
    c:\temp\glass\glass book1.gss n
    
    The command line paramater n will launch the file in "normal mode"
    
    If a file name is given, both paramaters are required.  
    
    If starting a new book manually, just have an empty gss file that ends with 
    the line "stp 0 0 0 0 0".
    
    If you need to see if the gss file is being parsed correctly, replace the
    n paramater with d.  This will run GLASS in debug mode.
    
    

    Working with formulas.
    
    Note: The GLASS engine will not process numbers in a cell, if the cell content 
    has been marked as a string and not a number.
    
    Formulas:
    
    Valid formulas:

     =avg( )          average value of 2 or more number values
     
     example:
     
     =avg(a1:a7)
     

     =cou( )          count - counts the number of numbers in a range.

     =flr( )          floor - rounds down number to whole value

     =max( )          max value of 2 or more values

     =min( )          min value of 2 or more values

     =sum( )          sum of 2 or more values
     
     Example of =sum( )
     
     =sum(a1,a7)
     
     will add two cells a1 and a7
     
     =sum(a1:a7)
     
     will add all the cells starting with a1 to a7.
     
     
     Note: any entry in a cell that you don't want to get saved, prefix with 
     double underscores: __