OpenGL newbie seeks help!

Hey /prog/, I'm writing a cross-platform OpenGL application which does some off-screen rendering. I've found two ways of doing that - with pbuffers and with FBOs, the latter is preferable. I want old videocards to be supported too.
Now tell me, which technique should I use? Do the older videocards support FBO? Do they support pbuffers?
Thanks.

>>12
You're stuck in the past. The framebuffer pointer paradigm is utterly inefficient and definitely doesn't give you access to "raw machine power”. Nowadays, for most purposes, even a lousy Intel GMA can give you more performance than real mode-style framebuffer access. And in the cases where you really need it, there's still offscreen rendering or glReadPixels.

>>13
I like how you are comparing a statement for pixel plotting (with a typo) and a double-buffered window initialisation procedure with mode-setting and OpenGL context creation. It's totally the same thing!