NumberOfButtons

HKLM\SYSTEM\CurrentControlSet\Services\i8042prt\Parameters

Data type	Range	Default value
REG_DWORD	0x1 - 0xFFFFFFFF	0x2

Description

(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.

Note Image Note

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.