See "WPS classes" for an introduction to what WPS classes are all about.

Warning: The WPS Class List object allows you to make changes which will render your system unusable. If you don't know the meaning of a certain class, or if you don't know what WPS classes are good for altogether, you should not make any changes here. You can safely view all information, but you should not manipulate the WPS class list if you don't know exactly what you're doing. Many changes that this page allows will make your system unstable (if you're lucky) or will prevent the Workplace Shell from starting at all so that you might have to re-install &os2; altogether. In any case, make sure that you have a made a WPS backup before changing anything.

The class list window is split into three subwindows, whose separators may be moved using the mouse.

If you select a class in the class tree on the left, the two subwindows on the right will show you additional information about this class.

1. At the top right, you get WPS-related information, such as the class name, the default class title (as shown in the third column of a folder's Details view), and the DLL which contains the class.

   If this DLL is on the LIBPATH, in most cases no additional path will be shown. This applies especially to most WPS standard classes, which are contained in \OS2\DLL\PMWP.DLL.

   Also, the "class default" icon is shown, which is usually hard-coded into the class. This is the icon which is displayed by default if no custom icon has been set for an object on the object's "Icon" notebook page.

   In most cases, if the selected class is known to &xwp;'s author, you will also receive a short description of the class.

2. At the bottom right, lots of method information is displayed which is retrieved directly from the SOM kernel (upon which the Workplace Shell relies to organize its classes). This information is probably only of interest for WPS programmers and pretty similar to the output of the fabulous "RWX" utility.

   Depending on the selection at the top, this subwindow displays either all the instance methods or the class methods of the currently selected class.

   For each method, you get the following method information (you might have to move the container's split bar to view all the fields):
   

   1. Method index. This is used by SOM internally to quickly resolve methods according to method tables. This is the index at which the method is stored in the class's method table. Note that the same method does not necessarily have the same index in different classes.

   2. Method name. Well, that's the method name.

   3. Address. The procedure pointer that SOM has returned when the method was resolved. This pointer will differ for different classes if a class has overridden a method, of course.

   4. Class. The class which introduced (first defined) the method.

   5. Overridden by. A list of classes which have overridden this method. Note that only classes up to the currently selected class are shown. If any other descendant classes of the current class override this method, this is not shown. Select the descendant classes to view that information.
   
   Note that you can sort the method information according to four different criteria for additional lucidity. Right-click in the title-area of the method display (where the column titles are), and you'll get a &popmenu; with the sort options.

If you press mouse button 2 in an empty area of the left window, a different &popmenu; appears. This one allows you to register a new class.