Ok. Thanks a lot for your time!
I think PsExec is the way (just because i didn't undestand the other option). But now i'm having some troubles with PsExec.
My line is: psexec \\Juanpablo1 -u Juan Pablo "c:\u2000\ultra.bat" Juanpablo1 is the pc name (where the file i want to access is located) and Juan Pablo is the user name in that PC. It asks me for a password, but i doesn't have. And then it says "Access denied".