... sets the default value for 1 of 2 echo settings, namely the one determining echoing during batch execution. At least that is what I gather from our Help. option //BatchEcho=No should, according to the same Help, "take effect immediately, and be in effect for the current session." Whereas in my TCStart it has no effect. SETDOS /V0 has also does not suppress default echoing. Only ECHO OFF does what I expect it to do. I am confused.