select stockfile
     assign to "b:warehs.buy".
            In this example, opening stockfile will cause the warehs.buy file on the b: drive to be opened.
 select printfile
     assign to "prn:".
            In this example, writing to printfile will cause data to be output to prn:, the first parallel printer.
 select input-file
     assign to "data\prog".
            In this example, opening input-file will cause the file prog in the data directory (relative to the current directory) to be opened.