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• Stop - Ends the interactive session
• Flush Texture Cache - If you've altered textures and want to see the changes, flush the cache to update them in the session
• Render Selected Object Only - This will render only the objects that are selected in the viewport. Take care not to leave this on accidentally or you may consider this an error
• Camera - Specify the camera to render from (if not from the last active viewport)
• Resolution - Specify the resolution (test percentages, etc.)

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You may toggle a progress bar at the bottom the viewport by right-clicking the IPR button. You can find settings for this display in the RenderMan Preferences.

Additionally, you may right-click on the camera icon to send a snapshot to the Image Tool ("it") with or without the geometry outlines, we default to an anti-aliased version but can be turned off by deselecting "smooth geometry"

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