[Chimera-users] command files

I have a command file that has a number of reset commands. I would like to 1) interrupt a command file during execution, aborting all further commands, stopping the graphics configuration at the abort (e.g. threshold values, active models, etc) 2) be able to place a hold in a command file, say after the a reset command, and be able to continue the command processing after pressing a key on the keyboard. Does this capability exist? thanks, Matt