Most skins include a 'system message' area where event messages and control tooltips will appear (on the default skin it is located just under the timer). Check this message area when moving the mouse over a control to get a description about the control's function. Descriptions that appear in parenthesis '()' are right-click functions.
KEYBOARD ACCELERATORS
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-- Playback --
Eject playlist Q
Previous track W
Next track E
Stop R
Pause T
Play Y
Seek ahead 5 sec RIGHT Arrow
Seek back 5 sec LEFT Arrow
-- Playlist --
Add files INSERT, Ctrl+O
Add folder of files Shift+INSERT
Delete marked tracks DELETE, Ctrl+D
Delete unmarked tracks Shift+DELETE
Mark/Unmark all Ctrl+A
Toggle marked tracks Ctrl+X
Shuffle playlist S
Repeat current track D
Repeat all tracks F
Play track 'n' Playlist Number + ENTER
-- Within Playlist Search Control --
Find All TAB
Find Next DOWN Arrow
Find Prev UP Arrow
Play Current Match ENTER
-- Skin Control --
Load base skin Ctrl+0
Load skin mode 1 - 9 Ctrl+1...9
Open skin extension 1 - 4 Shift+1...4
Open skin browser Ctrl+S
Next skin mode Alt+S
Refresh skin F5
-- Misc --
Plugin Browser Ctrl+B
Edit Track Info Ctrl+E
Segment Editor Ctrl+G
Extended Info Ctrl+I
Music Browser Ctrl+M
Preferences Ctrl+P
Always on top Ctrl+T
Volume Up UP Arrow
Volume Down DOWN Arrow
-- Equalizer --
Equalizer Presets Ctrl+Q
Next EQ Preset Alt+Q
Previous EQ Preset Alt+Shift+Q
-- Visual Effects --
External Visuals Ctrl+V
Full Screen Visuals Ctrl+Shift+V
Next Visual Alt+V
COMMAND-LINE SWITCHES
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/play Tells QCD to start playing
/play d:\trackXX.cda Tells QCD to play track 'XX' on CDROM 'd:'
/play c:\mediafile Tells QCD to play 'mediafile'
/add c:\mediafile Tells QCD to add 'mediafile' to the playlist
/autoplay Used for windows auto play feature,
won't override QCD's current state.
/pause Pause CD (if playing)
/stop Stop CD (if playing)
/trkfwd Next track (if playing)
/trkbwd Back one track (if playing)
/eject d: Eject CDROM 'd:'
/ejectall Eject all CDROMs
/closeall Close all CDROMs
/ontop Set QCD to always be on top of other windows
/notontop Unset QCD to always be on top
/hide Minimize QCD
/show Shows QCD
/noactivate append to command line to stop activation of player