Keyboard Shortcut to Bring up Tools in Fusion

What's the difference between:
1) Shift-Space
2) Ctrl-Space
3) Ctrl-Shift-Space
on the Fusion page. Don't they all just bring up the tools dialog box?
Thanks,
Jay
1) Shift-Space
2) Ctrl-Space
3) Ctrl-Shift-Space
on the Fusion page. Don't they all just bring up the tools dialog box?
Thanks,
Jay