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Windows does not support independent access by a client to each device.

Windows supports the simultaneous connection of more than one keyboard and mouse device.

Keyboards are opened in exclusive mode by the operating system stack for security reasons.

The following additional information is important for keyboard and mouse manufacturers: A typical configuration consists of a PS/2-style keyboard operated through an i8042 controller, and a serial-style mouse operated through a serial port controller.

The figure on the left shows a keyboard and a mouse connected to a system bus through independent controllers. The following figures show two common configurations that employ a single keyboard and a single mouse. This topic describes the typical physical configuration of keyboard and mouse devices in Microsoft Windows 2000 and later. The following sections goes into details on the controllers. This section contains details on the class drivers themselves. Non-HID keyboards and mice can connect over multiple legacy buses but still use the same class driver. Troubleshoot a wireless mouse that does not function correctly.Mouse, touchpad, and keyboard problems in Windows.

If you are looking to fix a mouse or keyboard, see:

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