|Data type||Range||Default value|
|REG_DWORD||0x1 - 0xFFFFFFFF||0x2|
(This entry has limited use in Windows 2000. See Notes below.)
Specifies the number of buttons on the mouse port mouse at startup. If the number of buttons detected at startup is incorrect, you can override it by changing the value of this entry.
This entry is used only when a device is installed. When the system recognizes a new device, it copies this entry to a device-specific subkey in the Enum subkey. Thereafter, it uses only the entries in Enum.