Controls whether palettes can be made transparent.

When transparency is available and turned on, you can use the Transparency option on the shortcut menu to set a different degree of transparency for the current palette or for all palettes.

When transparency is unavailable or turned off, all palettes are opaque. 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.

Available settings depend whether hardware acceleration is enabled. When hardware acceleration is enabled, setting 2 and 3 are available; when disabled, setting 0 and 1 are available.

This system variable determines the default setting in the Transparency dialog box > General section > How transparent should the palette be? option.