Easiest way to find these is the UI editor. So that you dont have to look these up, here's a full listing of the (semi-useful) windows:
(!empty($user->lang['CODE'])) ? $user->lang['CODE'] : ucwords(strtolower(str_replace('_', ' ', 'CODE'))):
Inventory.
Market - Market board
Store - Open/close shop
Merchant
Trade
Bag
Bank
Examine
HTML - mini-browser
Inventory
Loot
Popup.
LoadSkin
SetPrice
RewardPack
Book_Simple - appears to be an unfinished simple version of the knowledge book
BugReport
FeedbackReport
GroupOptions
ScriptExecutor - GM tool to execute zone scripts?
TypeReport
Questionnaire - In-game questionnaire??
UsageAlarm
ZoneTeleporter - unusable, but very interesting...
Claim
PopupInstructions - tutorial textbox
PlayerHousing.
PurchaseHouse
PlayerHouse
InteriorCustomization
VisitInnRoom
TradeSkills.
TradeSkills - Recipe book
MainHUD.
QuantitySelector
RadialMenu
Society
AdvancementChoice
AdvancementButton
Tracking - blank if not a tracking class
Guild
Persona
Raid
InspectPlayer
Instruction
ReplyDialog
Waypoint
Shutdown
Quickbar - Unimplemented 'quickbar' version of hotkeys
Hotkey
EditMacro
Socials
Target
Death
Socials
Target
Death
Knowledge
ChatOptions
Breath
ButtonbarPopup
Casting
Character
Clock
Compass
Effects
GroupMembers
Help
Heroic
JunctionChoice
MainChat
Maintained
Map
Memorized
OnscreenMessage
Pet
Player
Skills
WindowSettings
Experience
RestartTrialButton - From a possible Trial version of EQ2?
StartMenu - EQ2 'I cant believe Its not a start button' menu
StartButton - EQ2 button
LetterboxFrame
This last patch supposedly added some things, but these are the 'good' ones.