By default the mouse cursor is represented by an arrow except in graphics regions (such as %gr (Graphics Region)) where by default it is represented by a cross. Two formats are supplied to change the mouse cursor representation. %dc (Default Cursor) sets the default cursor for the window as a whole, and %cu (Cursor) sets the cursor for the next control in the window. Each is followed by a standard character string (i.e. a string in square brackets or an @ character indicating that the required string is supplied as an argument). The string should be the name of a CURSOR resource. By using a grave accent (`), you can use constants representing the standard Windows cursors. These constants are defined in windows.ins.
For further information see %dc (Default Cursor).
%cu (Cursor) and %dc (Default Cursor) also have a more complex form in which several alternative cursors are supplied, together with an integer used to select the one to use. The integer should be in the range from 1 to the number of different cursors supplied.
Whenever the cursor is in the main window, its shape will be governed by the current value of k. The %cu format is used in a similar way.