>Thank a lot Herman, by this way my createProcess will no more make a screen, no more flash when running a new child process.
>

Look at API_APPRUN - the use of the optional third parameter set as "HID" will launch an app with 0 visibility on the desktop or taskbar.

>I'll tried it as soon as possible and tel you how it's work, do you experimenting some trouble using createprocess and VFP, I need to write some function to write/read data to/from memory, because if you can pass data to your new process, I don't know another way to pass data form your new process to your parent one.
>

ClsHeap contains a set of UDFs to read and write memory, but each process has its own address space, unless you use memory-mapped files and mapped file views, direct memory exchanges probably aren't practical. I'd suggest using some method of data interchange; WIndows Messages passed via SendMessage/PostMessage or the use of a named pipe or mailslot might well work for you. And there are always DDE and COM...