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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.
#DEFINE MAX_PATH 260
#DEFINE OSK_EXE "osk.exe"

DO declare
= ShellExecute(0, "open", GetOskPath(), "", "", 1)
* end of main

FUNCTION GetOskPath() As String
    LOCAL cPath

    cPath = PathCombine(;
        GETENV("windir"),;
        "sysnative",;
        OSK_EXE )

    IF FILE(cPath)
        RETURN m.cPath
    ENDIF

    cPath = PathCombine(;
        GetSysDir(),;
        OSK_EXE )

RETURN IIF(FILE(cPath), m.cPath, OSK_EXE)

FUNCTION GetSysDir
    LOCAL cBuffer, nBufsize
    cBuffer=REPLICATE(CHR(0), MAX_PATH)
    nBufsize= GetSystemDirectory(@cBuffer, LEN(cBuffer)) 
RETURN SUBSTR(cBuffer, 1, nBufsize)

FUNCTION PathCombine(p1, p2, p3, p4, p5) As String
    LOCAL cBuffer, cPath1, cPath2, nIndex, nCount
    nCount = PCOUNT()

    DO CASE
    CASE nCount = 0
        RETURN ""
    CASE nCount = 1
        RETURN p1
    ENDCASE

    cBuffer = m.p1

    FOR nIndex=2 TO nCount
        cPath1 = STRTRAN(m.cBuffer, CHR(0), "")
        cPath2 = EVALUATE("m.p" + TRANSFORM(m.nIndex))
        cBuffer = REPLICATE(CHR(0), MAX_PATH)
        PathCombineApi(@cBuffer, cPath1, cPath2)
    NEXT
RETURN STRTRAN(m.cBuffer, CHR(0), "")

PROCEDURE declare
    DECLARE INTEGER GetSystemDirectory IN kernel32;
        STRING @lpBuffer, INTEGER nSize

    DECLARE INTEGER ShellExecute IN shell32;
        INTEGER hWindow, STRING lpOperation,;
        STRING lpFile, STRING lpParameters,;
        STRING lpDirectory, INTEGER nShowCmd

    DECLARE INTEGER PathCombine IN shlwapi;
    AS PathCombineApi;
        STRING @lpszDest, STRING lpszDir,;
        STRING lpszFile

User rating: 7.5/10 (4 votes)
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1457 bytes  
Created: 2012-02-18 22:46:23  
Modified: 2013-08-14 11:46:10  
Visits in 7 days: 153  
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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