keepalive from commandline??

how do i start a scp session by commandline and keepalives?

i use a bat file with this text:

@echo off
start WinSCP.exe scp://user:pwd@site.org

how can i tell winscp to keep connection alive?

Anyone able to help me??
tell me if question was not clear..

You cannot enable keepalives from command line. You may setup a stored session with enabled keepalives and open it from command line.