Dual Fullscreen (Alt + Enter / Ctrl + Alt + Enter)
When two monitors are connected you may use this mode to display images at maximum possible size on both monitors.
Either the left (Alt + Enter) or right (Ctrl + Alt + Enter) monitor may be chosen as SPM's primary.
For more details of setting-up dual monitors and the display-modes 'Dual Fullscreen' can be used with,
see section 'Using Multiple Monitors with SPM' .