>I need to run the "openssl" command line utility and return the value to VFP application without open the dos command line.
>
>Any ideas how to do that.

Olá, João.

You can run it through a batch file that can act upon the exit code openssl returns in a manner (say, by creating adequate report files) that can be read by your application. RUN /N2 batchfilename.bat to execute it minimized.