Using Win32 functions in Visual FoxPro Image Gallery
Code examples:
Custom GDI+ class
Displaying Windows shell folders in TreeView control with Visual FoxPro FLL
How to display Windows On-Screen Keyboard
Winsock: sending email messages (SMTP, port 25)
Obtaining names and positions for shortcuts located on the Windows Desktop
Browsing Windows Known Folders (Special Folders)
How to make a VFP form fading out when released (GDI version)
Splash Screen for the VFP application
How to change display settings: screen resolution, screen refresh rate
Enumerating devices installed on the local machine
Displaying dimmed window behind VFP top-level form
Subclassing CommandButton control to create BackColor property
Class for sound recording
Storing screen shot of a form to bitmap file
Accessing Adobe Reader 7.0 main menu from VFP application
Vertical Label control
Winsock: connecting to a news server (NNTP, port 119)
GDI+: Implementing image scrolling with inertia
Moving shortcut to a specified position on the Windows Desktop
Using FoxTray ActiveX control: System Tray Icon and menu attached to VFP form
Displaying icons in the system tray (VFP9)
Creating a console window for Visual FoxPro application
Using Month Calendar Control (VFP9, Comctl32.dll)
Using the DrawText function
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: 113  
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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