To load a Prolog program from disk, choose the Open option from the File menu.
A standard Macintosh load dialog will be displayed. Select the file containing the
program from the dialog box (a box containing a message requesting more information
from you) by clicking on its name and making it highlighted. If your source file is
not among one of the files displayed in the dialog box, click the Desktop button
to select another disk until the file is found. Load the selected file by clicking
the Open button. The program will be compiled automatically when it is loaded.
Note that every window is associated with a particular file. You can load several files
into memory provided that the window names are not repeated.