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On Boot
Key Combo Effect
mouse down Eject removable media.
option Brings up OF system picker on New World machines - boots to 9 on pre-New World mcahines.
command-option Hold down until the 2nd chime, will boot into 9?
command-x (or just x?) Will boot into Mac OS X if 9 and X are on the same partition and that's partition you're booting from.
command-option-shift-delete Bypass startup drive and boot from external drive (or CD). This actually forces the system to NOT load the driver for the default volume, which has the side effect mentioned above. For SCSI devices it searches from highest ID to lowest for a partition with a bootable system. Not sure about IDE drives.
command-option-shift-delete-# Boot from a specific SCSI ID number (#=SCSI ID number).
command-option-p-r Zap PRAM. Hold down at least until second chime.
command-option-n-v Clear NV RAM. Similar to reset-all in Open Firmware.
command-option-o-f Boot into Open Firmware.
command-option-t-v Force Quadra AV machines to use TV as a monitor.
command-option-x-o Boot from ROM (Mac Classic only).
command-option-a-v Force an AV monitor to be recognized as such.
c Boot from CD. If set to boot to X and no CD is present, may boot to 9.
d Force the internal hard disk to be the startup device.
n Hold down until Mac logo, will attempt to boot from network server (using BOOTP or TFTP).
r Force PowerBooks to reset the screen.
t Put FireWire machine into FireWire Target Disk mode.
z Attempt to boot using the devalias zip from first bootable partition found.
shift (Classic) Disable Extensions
shift (OS X 10.1.3 or later) Disables login items. Also disables non-essential kernal extensions (safe boot mode).
command (Classic) Boot with Virtual Memory off.
space (Classic) Launches Extension Manager (or Conflict Catcher) at boot-up.
command-v (OS X) Show console messages during boot.
command-s (OS X) Boot into single user mode.
After Happpy Mac icon
Key Combo Effect
space (Classic) Launch Extensions Manager (or Conflict Catcher).
shift (Classic) Disable Extensions including MacsBug.
shift-option (Classic) Disable Extensions, except MacsBug.
control (Classic) Break into MacsBug as soon as it is loaded.
As Finder Starts
Key Combo Effect
command-option Rebuild desktop (whenever Classic Finder sees a new disk).
option (OS 9) Do not open Finder windows.
shift (OS X) Do not open Finder windows when launching Finder. The windows' states aren't changed to closed, as they will be reopened if you reboot again.
shift (OS 9) Do not launch anything from the 'Startup Items' folder.
In Finder
Key Combo Effect
option-click close window box (or command-option-w) Close all open Finder windows (except popup windows).
command-shift-option-w Close all open Finder windows (including popup windows).
command-right arrow Open folder in list view.
command-option-right arrow Recursively open folder and nested folders in list view.
command-left arrow Close folder in list view.
command-option-left arrow Recursively close folder and nested folders in list view.
command-up arrow Open parent folder. On Mac OS X, when nothing is selected and no windows are open, open User directory.
command-option-up arrow Open parent folder, closing current folder.
command-down arrow Open selected item. On Mac OS X, when nothing is selected and no windows are open, open the desktop folder.
command-option-down arrow Open selected item, closing current folder.
option-click (In disclosure triangle) expand or collapse all folders within that window.
tab Select next icon alphabetically.
shift-tab Select previous item alphabetically.
command-delete Move selected item to trash.
space (Classic) While navigating, opens folder under mouse immediately (with spring-loaded folders enabled).
In Finder Window Menu
command-select Close window
command-shift-select Put away popup window
command-option-select Expand selected window and close all others.
control-select Expand selected window and collapse all others.
control-option-select Activate selected window and expand all others.
On Disk Mount
Key Combo Effect
command-option Rebuild desktop (whenever Classic Finder sees a new disk).
option (OS 9) Add session numbers (;1,;2, etc) to ISO-9660 CD filenames.
option (OS X) Show each session on an ISO-9660 CD as a volume.
After Startup
Key Combo Effect
On machines with a power key
power Bring up dialog for shutdown, sleep or restart.
command-control-power Unconditionally reboot (sometimes referred to as 'control flower power' to easily remember) (dirty reboot - may corrupt disk).
control-command-option-power Fast shutdown.
command-power Bring up debugger (if debugger installed).
command-option-power Put late model PowerBooks and Desktops to sleep.
command-option-control-power (PowerBook 500) Reset Power Manager.
shift-fn-control-power (PowerBook G3, G4) Reset Power Manager.
On machines without power key
control-eject Bring up dialog for shutdown, sleep or restart.
command-control-eject Unconditionally reboot.
control-command-option-eject Fast shutdown.
command-eject Bring up debugger (if debugger installed).
command-option-eject Put late model PowerBooks and Desktops to sleep.
On all machines
command-option-esc Force quit current application.
command-shift-0 Put late model PowerBooks and Desktops to sleep. (No longer works in OS X). On Macs with three floppy drives (Mac SE) they eject the third floppy disk.
command-shift-1 or 2 Eject internal or external floppy. Not sure which is which on dual floppy machines (Mac SE, Mac II, etc.).
command-shift-3 Full screen shot
command-shift-4 Abstract user defined area screen shot (hold control while selecting to direct it to the clipboard on OS 9).
command-shift-capslock-4 (Classic) User selectable window screen shot
command-tab Switch applications (possible to change key combo in OS 8-9).
command-space Switch keyboards/script systems (if more than one is installed).
command-f1 (Ti PowerBook) Toggle between video mirroring and extended desktop mode.
command-f2 (Ti PowerBook) Auto-detect a newly connected external display.
f12 Eject CD/DVD (must be held down on 10.1.2 or later). If the device can be unmounted, it is. If not, nothing happens.
f14 (Cube/G4/iMac/other?) Dim display.
f15 (Cube/G4/iMac/other?) brighten display.
command-control-shift-0 (OS 9) Spin down HD (when possible).
option-'Empty Trash' Empty trash without locked file or contents summary alert. Empties locked items, as well.
command-option-d (OS X) Toggle Dock.
command-option (when opening Chooser in OS 9) Rebuild Chooser cache of printer driver information.
In the Sleep/Restart Dialog
Key Combo Effect
s Sleep
r Restart
esc Cancel
command-. (period) Cancel
return or enter Shut down
Power (OS 9.2.x only?) Cancel
In Other Dialogs
Key Combo Effect
esc Cancel
command-. (period) Cancel
enter Default button
return Default button (if there are no text fields that use return)
command-d Don't save (in save/cancel/don't save dialog)
On Keyboards with a Function Key
Key Combo Effect
fn-backspace Forward delete
Click/Modifier Effect
Option-click in another application Switch to that application and hide the previous application.
command-drag (window) Drag window without bringing it to front (requires application support to work behind dialogs).
command-drag (window background) Pan contents of window with hand (Finder)
command-drag (OS X) Rearrange menu extras
command-click (window title) Pop-up menu showing path to current folder/document (in some applications)
option-windowshade (Classic) Windowshade all windows of application.
option-zoom Zoom window to full-screen.
option-yellow (OS X) Dock all windows of application.
option-green (OS X) Zoom window to fill screen (in some applications).
Mac OS X only- items in Dock
command-click Reveal in Finder
command-option-click Activate application and hide other applications.
control-click (or click and hold) Contextual menu
command-drag into Dock Freeze current Dock items from moving so icon can be dropped onto an application.
command-option-drag into Dock Force an application you're dropping onto open dropped item.
Control Strip
Key Combo Effect
option-drag control strip Move control strip
option-drag CS module within strip Reorder CS modules
option-drag CS module to trash Uninstalls a module
option-drag CS module elsewhere Moves module to that location.