In Rhino 7 you’d not use Raytraced for your final renderings but instead switch it to some other mode, then use _Render with the default renderer Rhino Render. This is the same engine as Raytraced. You won’t run in the case of having two sessions running at the same time (unless you have a viewport in Raytraced).
ViewCaptureTo* commands will start a new render if any of the following is true:
- resolution is different from viewport
- background setting (i.e. transparency) is different from viewport
- requested sample count is larger than what viewport is currently at