How to render a higher resolution scene

My computer has the highest resolution of 1024768. But I want to draw a bitmap of 20481536, which is 4 times larger extend my computer can display. My option is draw the large bitmap in memory and display 1/4 part of it on my computer at a time. How can OpenGL achieves it? Thanks for reply

Checkout the OpenGL tile rendering library:

http://www.mesa3d.org/brianp/TR.html