Click the "Show branch and ending" button will show all branches and endings under the current move.
Click the "Trial board" button will copy current board for try out. Click it again will return to previous state.
Menu item "Tools-Iterate nodes" will show all endings under current move.
Right after application start, press ALT+H will toggle graphic mode.
When text box has the focus, ALT+R will change to random mode, middle mouse button changes file. CTL+ALT+R gives opacity. ALT+L shows color mode. Click at the edge shows next move. Right click at the root node enters trial mode. CTL+R and CTL+L change loading directory.
CTL+P will create jpg pictures with size 128 x 96 of selected sgf files.