Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
How to change display settings: screen resolution, screen refresh rate
Capturing keyboard activity of another application with the Raw Input API (VFP9)
Converting Unicode data from the Clipboard to a character string using a given code page
Copying picture of the active form to the Clipboard using Enhanced Metafile API functions
Enumerating raw input devices attached to the system (keyboard, mouse, human interface device)
Enumerating data formats currently available on the clipboard
GDI+: copying to the Clipboard (a) image of active FoxPro window/form, (b) image file
Disabling mouse and keyboard input for the main VFP window (with the app still running)
Current keyboard type
Storing content of the Clipboard to a bitmap file
Displaying icons in the system tray (VFP9)
Custom HttpRequest class (WinINet)
Attaching menu to a top-level form
Using Beep and Sleep functions to make the old tin buzz sing (WinNT only?)
How to activate Windows Calculator
Using InternetSetFilePointer when resuming interrupted download from the Internet
Minimizing all running applications
Storing screen shot of a form to bitmap file
Sending email messages with Simple MAPI
How to print a bitmap file
Drawing Windows predefined bitmaps using the LoadBitmap functions
Using Path functions from Shell Lightweight Utility APIs (shlapi.dll)
Obtaining current Internet Explorer browser version and UserAgent
Using EnumPrinters function to enumerate locally installed printers
How to display Windows On-Screen Keyboard

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Before you begin:

For data entry, instead of relying on the physical keyboard, user may choose to use Windows On-Screen Keyboard that gives access to all standard keys.

On-Screen Keyboard executable file, osk.exe, resides in System32 directory. Note that on 64-bit systems this file cannot be launched from 32-bit process. "File System Redirector" article on MSDN explains why:
32-bit applications can access the native system directory by substituting %windir%\Sysnative for %windir%\System32. WOW64 recognizes Sysnative as a special alias used to indicate that the file system should not redirect the access.
private static void StartOnScreenKeyboard()
{
    const string OskExe = "osk.exe";
    var winDir = Environment.GetEnvironmentVariable("WINDIR");

    if (string.IsNullOrEmpty(winDir))
    {
        return;
    }

    var oskPath = Path.Combine(
        Path.Combine(winDir, "sysnative"), OskExe);

    if (!File.Exists(oskPath))
    {
        oskPath = Path.Combine(
            Path.Combine(winDir, "system32"), 
            OskExe);
    }

    if (!File.Exists(oskPath))
    {
        return;
    }

    Process.Start(oskPath);
}

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558 bytes  
Created: 2012-02-18 22:46:23  
Modified: 2013-08-14 11:46:10  
Visits in 7 days: 66  
Listed functions:
GetSystemDirectory
PathCombine
ShellExecute
Printer friendly API declarations
My comment:

On-Screen Keyboard class name is "OSKMainClass". With this knowledge, a VFP application can detect whether the On-Screen Keyboard window is visible -- by calling FindWindow. It can also move and hide the keyboard -- by calling SetWindowPos or similar API function.
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