27.11. The 
button that is located in Spherical Panorama settings window shows you the file created by the render in a separate window. The button is available if this file exists in a specified directory. Press and hold left mouse button to rotate Panorama, use mouse scroll wheel to zoom in or out.
'Rotation' option is used to rotate Panorama automatically
Use 
button to save Spherical Panorama image in bmp, jpg, png format.
Use 
button to load Spherical Panorama image from bmp, jpg, png file