For a sample picture (from a much older version of CSDS), see http://www.ceder.net/csds/help/csds_callfromscreen.html
A large portion of the window is used for the 'primary' frame. The 'secondary' frames are located on the right-hand side. The 'Call from Screen' windows of CSDS uses single-keystrokes to switch which frame is the 'primary' frame. For instance, while you are calling, press 'C' to view the cuesheet, then press 'F3' to view the third sequence frame. Or press 'L' to view the lyrics, 'M' to display the music player, 'P' to play the music, etc.