1. A method for accessing an instance of a recreatable object in a shorter-duration memory based on a reference located in a longer-duration memory, wherein the shorter-duration memory is associated with a call, the method comprising the steps of: locating, within the shorter-duration memory, a context structure associated with the call; locating an XREF pointers array based on data cached within the context structure; determining whether the XREF pointers array includes a pointer associated with said reference; and if the XREF pointers array includes a pointer associated with said reference, then following said pointer to locate said instance within said shorter-duration memory.