Abstract: A mechanism for locating and calling an appropriate member function to process a message or command in an event-based system is provided. An object data structure contains data members and a pointer to a virtual function table. The virtual function table contains pointers to member functions associated with the object. The virtual function table contains a pointer to a member function that returns the address of a message map. The message map contains two entries: a pointer to a base message map and a pointer to an array of message map entries. The array of message map entries contains the addresses and parameters of member functions. A default window procedure member function searches the array of message map entries to locate a desired member function. If the desired member function is not located in the array of message map entries for the derived class, then the window procedure member function searches the array of message map entries for the base class of the derived class.

Abstract: A method and system for allowing an interrupted computer program to detect the occurrence of an interrupt. In a preferred embodiment, a system according to the present invention allows an Intel 80286-compatible based computer program executing in real mode to detect the occurrence of an interrupt during the execution of a set of instructions. According to a preferred method of the present invention, the LOADALL instruction is used to load the code segment selector with the segment address of the code in the interrupted routine to be executed upon return from an interrupt and to load the code segment base address with the segment base address of the set of instruction during whose execution interrupt is to be detected. A preferred method then executes the set of instructions. Upon occurrence of an interrrupt, the preferred method saves the value in the code segment selector and executes an interrupt routine.