how to use Extended Memory on DOS ?

[Dara UNG]

    I'm sorry if my question is not appropriated to this group.

    I'm writing an application program using Microsoft C 5.1 under
    MS-DOS V 3.3

    Prob: due to the large size of the application program, which is
    approximately 640 Kb Dos limit, thus I would like to allocate the
    executable codes ( or part of it) to the extended memory area.

    If anybody knows how to do this or has any suggestion please email
    to me at :

    dara at cs.mcgill.ca

    Thanks in advance,

    TH