CH_DOWN     - channel down
CH_UP       - channel up
VOLUP       - volume up
VOLDOWN     - volume down
POWER       - Power off
MUTE        - mute
TV          - TV
CHG_INPUT   - AV
HOME        - Home screen
APPS        - Apps
GUIDE       - Guide
RED         - red
GREEN       - green
YELLOW      - yellow
BLUE        - blue
VTOOLS      - VIERA tools
CANCEL      - Cancel / Exit
SUBMENU     - Option
RETURN      - Return
ENTER       - Control Center click / enter
RIGHT       - Control RIGHT
LEFT        - Control LEFT
UP          - Control UP
DOWN        - Control DOWN
3D          - 3D button
SD_CARD     - SD-card
DISP_MODE   - Display mode / Aspect ratio
MENU        - Menu
INTERNET    - VIERA connect
VIERA_LINK  - VIERA link
EPG         - Guide / EPG
TEXT        - Text / TTV
STTL        - STTL / Subtitles
INFO        - info
INDEX       - TTV index
HOLD        - TTV hold / image freeze
R_TUNE      - Last view

REW         - rewind
PLAY        - play
FF          - fast forward
SKIP_PREV   - skip previous
PAUSE       - pause
SKIP_NEXT   - skip next
STOP        - stop
REC         - record

numeric buttons
D1 D2 D3 D4 D5 D6 D7 D8 D9 D0

P_NR        - P-NR (Noise reduction)
OFFTIMER    - off timer
R_TUNE      - Seems to do the same as INFO

others (depends on type of your TV)
CHG_NETWORK
CC
SAP
RECLIST
DRIVE
DATA
BD
FAVORITE
DIGA_CTL
VOD
ECO
GAME
EZ_SYNC
PICTAI
MPX
SPLIT
SWAP
R_SCREEN
30S_SKIP
PROG
TV_MUTE_ON
TV_MUTE_OFF
DMS_CH_UP
DMS_CH_DOWN