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Before you begin:
This code sample explains how to programmatically open an instance of Windows Calculator.

PUBLIC frm
frm = CreateObject("Tform")
frm.Visible = .T.

DEFINE CLASS Tform As Form
#DEFINE WM_QUIT 18
#DEFINE SW_SHOWNORMAL 1
    Width=400
    Height=200
    Caption="Activate Windows Calculator"

    ADD OBJECT cmdShow As CommandButton WITH;
        Caption="Show Calc", Height=24, Width=100,;
        Top=5, Left=10

    ADD OBJECT cmdHide As CommandButton WITH;
        Caption="Hide Calc", Height=24, Width=100,;
        Top=5, Left=112

PROCEDURE Init
    THIS.declare

PROCEDURE Destroy
    THIS._hide

PROCEDURE cmdShow.Click
    ThisForm._show

PROCEDURE cmdHide.Click
    ThisForm._hide

PROCEDURE _show
    LOCAL hWindow
    hWindow = FindWindow(Null, "Calculator")

    IF IsWindow(hWindow)=0
        = WinExec("calc.exe", SW_SHOWNORMAL)
        DOEVENTS
        hWindow = FindWindow(Null, "Calculator")
*        = SetParent(hWindow, _vfp.HWnd)
    ENDIF

    IF IsWindow(hWindow) <> 0
        = SetForegroundWindow(hWindow)  
*        = SetParent(hWindow, _vfp.HWnd)
        THIS.PasteNumber(PI())
    ENDIF

PROCEDURE _hide
    LOCAL hWindow
    hWindow = FindWindow(Null, "Calculator")
    IF IsWindow(hWindow) <> 0
        = PostMessage(hWindow, WM_QUIT, 0,0)
    ENDIF

PROCEDURE PasteNumber(cNumber)
#DEFINE WM_KEYDOWN 0x0100
#DEFINE WM_KEYUP 0x0101
#DEFINE VK_CONTROL 0x11
#DEFINE KEYEVENTF_EXTENDEDKEY 1
#DEFINE KEYEVENTF_KEYUP 2

    LOCAL hWindow
    hWindow = FindWindow(Null, "Calculator")

    IF hWindow <> 0
        * stores the number in the Clipboard
        STORE TRANSFORM(m.cNumber) TO _cliptext

        * makes Calculator the foreground window
        = SetForegroundWindow(hWindow)

        * simulates CTRL+V keystroke
        = keybd_event(VK_CONTROL, 0, 0, 0)
        = keybd_event(VkKeyScan(ASC("V")), 0, 0, 0)
        = keybd_event(VkKeyScan(ASC("V")), 0, KEYEVENTF_KEYUP, 0)
        = keybd_event(VK_CONTROL, 0, KEYEVENTF_KEYUP, 0)
    ENDIF

PROTECTED PROCEDURE declare
    DECLARE INTEGER SetForegroundWindow IN user32;
        INTEGER hWindow

    DECLARE INTEGER IsWindow IN user32 INTEGER hWindow

    DECLARE INTEGER FindWindow IN user32;
        STRING lpClassName, STRING lpWindowName

    DECLARE INTEGER WinExec IN kernel32;
        STRING lpCmdLine, INTEGER nCmdShow

    DECLARE INTEGER PostMessage IN user32;
        INTEGER hWindow, INTEGER Msg,;
        STRING @wParam, INTEGER lParam

    DECLARE keybd_event IN user32;
        SHORT bVk, SHORT bScan, INTEGER dwFlags,;
        INTEGER dwExtraInfo

    DECLARE SHORT VkKeyScan IN user32 INTEGER ch

    DECLARE INTEGER SetParent IN user32;
        INTEGER hWndChild,;
        INTEGER hWndNewParent

ENDDEFINE

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2452 bytes  
Created: 2001-07-12 12:00:00  
Modified: 2009-12-28 21:59:15  
Visits in 7 days: 100  
Listed functions:
FindWindow
IsWindow
keybd_event
PostMessage
SetForegroundWindow
SetParent
VkKeyScan
WinExec
Printer friendly API declarations
My comment:
Btw, you can use the SetParent function to make the main VFP window (_screen.hWnd or _vfp.hWnd) the parent window for the Calculator. In that case the calculator window becomes confined in the main VFP window.
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