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This will load grab your current viewport and put it as a background for your VRay. Really useful for when you want to do a region render in the VFB but don't know where to draw your region. It's clever enough to crop to your safe-frames, and resize to your render size, upscaling to large resolutions won't give you the best quality but should hopefully help!
A simple script that is pretty similar to max's own "Save active perspective view" and "Restore active perspective view" functionality just that there are 5 slots with preview images. Un-comment the first 2 lines to install it as a macroscript. Click the little lock symbol to save a view, click the image button to restore it.