autocad, safe frame toggle, make window proportioned to render

Hi there!

I am pretty new in autocad, but I've been using 3d studio for years and I have some terrible issues about rendering that are driving me nuts..

how can i have a preview of the area that is going to be rendered in the model window? (this command in 3d studio is SHIFT+F, for the ones that know what i'm talking about..)

so this is the point, I have to make a bunch of images all from the same spot and with the same framing, but doesn't matter, even if I save the views, the rendered image is always different. (this mostly because

I'm using multiple computers, so it's enough that the machine has a different screen resolution or that autocad on a different machine has a different user interface, to make the render completely different.... I'd solve it using always the same computer, but it's part of the request from my new boss)...

another question is there a way, if I set up a camera to have a proportioned view? it looks that the camera preview window is totally random and can just give an idea of the camera view, but nothing really serious.

can someone help me??

I never use rendering. Don't know. Plenty of people do I 'm sure, but in terms of percentage, its probably low.