When reviewing a patient with multiple studies, you can touch certain studies to only send certain ones, the color coating is opposite of the buttons for panning, brightness and zoom are in the acquisition screen. When a study has a light blue header, it seems to be deselected for sending the study to anywhere (USB, SmartPacs, or AIS). When the header is white/blank, this means it is selected for sending (this is confirmed when checking the send-out status DICOM spooler).