Multiple rendering target in OpenGL, articles

http://veelck.wordpress.com/2008/11/28/multithread-texture-loading-in-opengl/
http://www.rchoetzlein.com/theory/2010/multi-monitor-rendering-in-opengl/
http://www.codenet.ru/progr/opengl/faq/gl_024.php

[b]background rendering[/b]
http://www.songho.ca/opengl/gl_mvc.html