Use of a resource identifier to import a program from external memory for an overlay

An apparatus comprising:

• a first memory having a first portion as a static section to store a main program which uses functional programs, a second portion as a dynamic section to store other programs which reside in the first memory for a shorter duration than the main program, and a prelude space to store preludes which provide resource identifiers to identify the functional programs to be loaded into an overlay space located within the dynamic section;
• and
• a second memory operably coupled to store the functional programs and to transfer a particular functional program into the overlay space when the main program performs a functional operation without identifying the particular functional program stored in the second memory, but in which a corresponding prelude in the prelude space for the functional operation provides a corresponding resource identifier to identify the particular functional program to be loaded into the overlay space.

A multi-function handheld device comprising:

• a system on a chip integrated circuit that includes an internal memory arranged to have a first portion as a static section to store a main program which uses functional programs, a second portion as a dynamic section to store other programs which reside in the internal memory for a shorter duration than the main program, and a prelude space to store preludes which provide resource identifiers to identify the functional programs to be loaded into an overlay space located within the dynamic section, the overlay space to have a fixed entry address;
• and
• an external memory operably coupled to the integrated circuit to store the functional programs and to transfer a particular functional program into the overlay space when the main program performs a functional operation without identifying the particular functional program