dos memory segment (65536 Bytes) :(

Please tell me that how can i allocate a link-list type structure pointer to a size greater than a dos memory segment (65536 bytes) in TC 3.0.

I want to use this in my own graphics function like getimage(),
putimage(), in true color 24 bit VESA mode.Also tell me about the fastest getimage(),putimage() procedure.

Please help me.