Controls whether palettes can be made transparent.
When transparency is available and turned on, use the Transparency option on the shortcut menu to set a different degree of transparency for the current palette or for all palettes. Transparency is unavailable when palettes or windows are docked, when transparency is not supported by the current operating system, or when a hardware accelerator is enabled.
When hardware acceleration is enabled, the settings 2 and 3 are available; when disabled, only the settings 0 and 1 are available.