Double click on the icon of a function to open the generic function editor.
This window provides :
The universal type, which means "any type", or "T" for "true" in Lisp is represented by this icon : . This means that the method accepts any type of argument.
The applications of a generic function can be extended by user-defined methods , so that it can accept new types of input arguments.
The "compiled function" or "compiled method" messages appear when clicking on a Lisp function box or in a method icon within a generic function editor. This means the function is protected. It is internally defined in OM and cannot be modified through the graphic interface.
However, user-defined methods can be open in method editors.