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When you have set the cooperative level to DISCL_FOREGROUND and the focus switches to another application (or even to the menu in your own application), Microsoft Windows might force your application to unacquire the mouse. For this reason, you should check for the DIERR_INPUTLOST return value from the IDirectInputDevice8::GetDeviceData or the IDirectInputDevice8::GetDeviceState method, and attempt to reacquire the mouse if necessary. (See Acquiring Devices.)