1. A method of initiating a break in program code running in process space of a local processor, the method comprising: providing a shadow mechanism in said process space with one or more shadow segments respectively corresponding to each of one or more remote hardware memory segments to be accessed by the program code; detecting occurrence of a break event indicated in said one or more shadow segments; and halting execution of the program code in response to the detecting of the break event as indicated in said one or more shadow segments.