Abstract: A method and apparatus are provided for integrating application programs and objects of the application programs in an integrated graphical user interface processing environment, such as a windows environment. The method and apparatus facilitate the integration without requiring modifications of the application program software, and without requiring that the application programs conform to any particular communication protocol. When a command input, such as a mouse click by a user in a windows environment, indicates that an object from one application is to be dropped onto a window in which another application is running, the properties of the window and the attributes of the object are used to search a rule database to identify a rule which is applicable to these particular types of object and application. The rule contains an action clause, which specifies various actions which are to be executed automatically, to invoke a desired operation by or related to the application program on the object.