Microsoft KB Archive/169588

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HOWTO: Programmatically Undock Using the Keyboard Buffer

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Q169588

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The information in this article applies to:


 * Microsoft Win32 Device Driver Kit (DDK) Windows 95
 * Microsoft Win32 Software Development Kit (SDK)

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SUMMARY
Windows 95 does not support a direct API to programmatically undock a laptop computer. However, you can undock the laptop by sending the appropriate keystroke sequence for the machine to the keyboard buffer.

MORE INFORMATION
From a VxD, you can use VKD_Force_Keys to force scan codes into the keyboard buffer just as if they had been typed on the physical keyboard. These keys are processed in the context of the focus virtual machine.

From an application, you can use the keybd_event function to synthesize the appropriate keystrokes to undock a laptop. The code below sends a CTRL ESC sequence:

     #include 

main {         keybd_event( VK_CONTROL,0x9d, KEYEVENTF_EXTENDEDKEY | 0, 0); keybd_event( VK_ESCAPE,0x81, KEYEVENTF_EXTENDEDKEY | 0, 0 ); keybd_event( VK_ESCAPE,0x81, KEYEVENTF_EXTENDEDKEY |  KEYEVENTF_KEYUP,0 ); keybd_event( VK_CONTROL,0x9d, KEYEVENTF_EXTENDEDKEY |  KEYEVENTF_KEYUP, 0 ); }