From the QALoad commands listing in help, RR__printf (or just printf) will output to the player window. If logging is enabled in Conductor Options, it will also print to the Player_..._Messages.trc log file.
LOG_ERROR outputs to the Conductor window, but I haven't tried it - not sure if it causes the script to abort like RR_FailedMsg, which also ouptuts to the Conductor.
There is also SCRIPT_MESSAGE to output to the Analyze Error report...
A problem is a difference between what is perceived and what is desired, that
we want to reduce (Dewey 1933)