Try this. This is from the thread:Re: 'Printing ...' Thread #542638 Message #542800

DECLARE INTEGER GetDesktopWindow IN WIN32API
DECLARE INTEGER LockWindowUpdate IN WIN32API INTEGER lnHandle
hWin = GetDeskTopWindow()
LockWindowUpdate(hWin)
REPORT FORM x TO PRINT
LockWindowUpdate(0)

You can use this "hide" the output window, but you still can't use this in a .DLL as it's still "there" as UI and won't work in a .DLL.

>I have a VFP 7 application .exe running minimized in background.
>
>I use a REPORT FORM command to create a PDF files for Web server.
>
>Unfortunately, REPORT FORM command causes my application window
>to become active.
>
>This is very annyoining since this occurs during user normal
>work and interrups this.
>
>How to prevent REPORT FORM command to
>activate a VFP application ?