Not up-to-date. See ingame-help for most recent commands/changes/new commands

name - refers to a string - example:

"Hand of Freedom" -- this is a string
Hand of Freedom -- not a string in lua

spell(name or id) - registers a spell for the specific icon
icon(name or id) - registers an item for the specific icon
flag(flag_name) - registers a specific flag for a specific icon ( valid flags can be found: here )

PlayerPower() - returns integer value of main power of player (rage, energy, focus, mana, rune power)
TargetPower() - same as PlayerPower just for your target ... dunno if anyone actually need this
PlayerBuff(name [, stack]) - returns true/false depending on match of name & stack
- stack is optional for non-stacking buffs/debuffs simply let it blank or write PlayerBuff(name, nil)
TargetBuff(name [, stack]) - same as PlayerBuff just for your actual target
TargetHP() - returns the HP% of your actual target
TalentGroup() - returns integer of actual talentgroup (first spec = 1, second = 2)
PlayerStance() - returns integer of actual stance/aura/shapeshift form

GrayscaleOn() - force the icon to be desaturated
GrayscaleOff() - force the icon to be saturated
ResetGrayscale() - reset any grayscale force
RangeOn() - force the icon to behave like target is out of range
RangeOff() - force the icon to behave like target is in range
ResetRange() - reset any range force
[NYFI]SetColor(r,g,b,a) - Colors the icon in RGBA - either all between 0 and 1 or 0 and 255 (one above 1 -> all are measured at 255)
- not forcing currently (use with GrayscaleOff & RangeOff to force currently)
ResetColor() - resets forced color
Hide() - Hide the icon
Show() - Shows the icon - use this if you used Hide() in the other "case of if" to show the icon again properly.

WowAce