I have used this w/o any problem so far in Vfp6. Don't remember where I got 
it from. Matt must be around. DDE is used here also.

*-----[ This goes at the start of the main program in your app.
PARAMETERS _APPNAME
 =ddesetoption("SAFETY",.F.)
 ch = ddeinitiate(_APPNAME,"SYSTEM")
IF CH != -1
     =DDETERMINATE(CH)
    QUIT
ENDIF
DO DDE_SETUP

PROCEDURE DDE_SETUP
    =DDESETSERVICE(_APPNAME,"DEFINE")
   =DDESETTOPIC(_APPNAME,"SYSTEM","DETECTED")
  RETURN

 *---[ This bit can go in your procedure file if you have one.
FUNCTION DETECTED
 PARAMETERS A,B,C,D,E,F
*     ZOOM WINDOW SCREEN MAX
RETURN .T.

 **------[End of Matt's Code



Regards

Ajoy Khaund
Neamati Road
Near Bhogdoi Bridge
Jorhat 785001-21
Assam, India

Tel: 91-376-2351288
Cell: 91-94350-92287
Mail: akha...@hotmail.com
Mail: akha...@gmail.com

"Walking on water and developing software from a specification are easy if
both are frozen."
- Edward  V. Berard, "Life-Cycle Approaches"

--------------------------------------------------
From: "Eurico Chagas Filho" <echagas...@terra.com.br>
Sent: Tuesday, July 14, 2009 4:41 PM
To: <profoxt...@leafe.com>
Subject: How to avoid two instances

>
> I came across a code written by Ramani to avoid two instances of an
> application in the same desktop.
> It uses extensively the DDE functions, is there anything I should be aware
> of ?
>
> TIA, E.
>
>
>
[excessive quoting removed by server]

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