Brightness - how light or dark a colour is (source: Wikipedia.org Color).

Color / Colour (British spelling) - the same meaning.  Windows colour is broken down into Red, Green & Blue (RGB) with numerical values from 0 - 255.  Black has RGB values of 0,0,0 while white is RGB 255,255,255.  Additional settings include Hue, Saturation, Light (HSL) with ranges from 0 - 255.

Colour Masks – a technical term, which allows the colorizing of skins.

Dialog Box - asks you do something, such as this "Delete tag" box.  It's a simple Yes or No (or Close) and includes: window frame, titlebar, and buttons that can be skinned:

Font - the style of each letter, number, or character in the alphabet.

Greyscale / grayscale - are the shades of gray between black & white.

Hue - the tint of a colour.

Opacity - is the blocking of light from passing through the object.  So if the titlebar is totally opaque or solid in colour, you can't see through it.  The opposite of totally opaque is to be transparent (see through).

Preset - is a way to save settings made to colouring & transparency settings for individual skins.  You can create multiple presets for each skin, handy if you have more than one person using the same computer or you want different setups. 

Saturation - can be described as the purity of a colour or the intensity or "the degree of difference from a gray of the same lightness or brightness" (American Heritage Dictionary, www.dictionary.com). Changes the colour to make it very bright to very dull/dark looking.

Skin - (same as Visual Style) are the computer graphics (i.e. colour, style) of the areas covered by the skin (i.e. window frames, toolbar icons, menus, buttons, ...). 

System Tray - is (by default) in the lower, right-hand corner of your screen with the clock.

Texture - is used to refer to the colouring & pattern of the skin's graphics.

Titlebar - is the top most frame of a window, and typically includes: an icon (far left) that if you click will open the system menu, title of the application or window, and buttons (minimize, maximize, close) on the far right.

Transparency - allows you to see thru an object, depending on what level the transparency is set too.  The opposite of transparent is opacity (solid in colour). 

UI - the User Interface (UI) is what you see on the screen when an application runs, such as: window, frame, title bar, buttons, various types of menus, fonts, colours, etc..

UIS1/UIS2/etc. – These are the different types of skins, they include: UIS1 (basic skin), Perpixel UIS1, UIS2, Perpixel UIS2) is displayed at the top of the menu.  "Perpixel UIS2" are very common for newer skins.  The "Perpixel" means the skin supports semi-transparent frames, rather than the usual basic shaped frames.

Visual Style - is the computer graphics (i.e. colour, style) of the areas covered by the skin (i.e. window frames, toolbar icons, menus, buttons, ...).

Wallpaper - is the graphic image (or color) of the background on your desktop (monitor).

Window Frame - is around each window, each skin can change the colour and style of this frame.

WindowBlinds can be unloaded from memory (stop it from running), so it doesn’t modify or change anything on your system.  It also will change your skin to the Windows Classic theme for Vista or XP.

If WindowBlinds is minimized to the system tray (near clock), right-click it and select “Unload”.  It will change to Windows Classic theme until your next reboot, then it will revert to Windows Aero (Vista) or XP Style (XP).

Alternately, you can create a shortcut (Vista or XP) to WBLOAD.EXE and in the shortcut, append to the “Target” the command “UNLOAD” (without quotes, must be in uppercase).

Example:
"C:\Program Files\Stardock\Object Desktop\WindowBlinds\wbload.exe" UNLOAD

Instead of “UNLOAD”, if you append “UNLOADGLASS” it will unload and change to the Windows Aero theme (Vista) or Windows XP Style (XP).