Render a single pass and click to stop. Use the cursor to draw a rectangle in the area you would like to render. Click the top button next to the rectangle. Voila, plop render.

This is not my "second childhood". I'm not finished with the first one yet.

Time flies like an arrow; fruit flies like a banana.

"I'd like to die peacefully in my sleep like my grandfather....not screaming in terror like the passengers on his bus." - Jack Handy