here are the different words in the statusbar
generation:
how many generations the pattern advanced
undo:
the number of undo states, that is
how many patterns are saved on the undo stack
redo:
the number of redo states, that is
how many patterns are saved on the redo stack
mode:
p is showed when pan mode is on.
d is showed when the drop selection before running option is checked.
t is showed when the table tool shows the next generation.
x is showed when xor mode is on.
color:
what color is selected
tool:
what tool is selected
board size:
the size of the board
pop count:
how many cells there are in the current pattern