The server waits for all previous parallel commands started by the script to complete. When all previous parallel commands are complete, the server allows the script to continue. The script can attempt to start more parallel commands.
The server waits for all previous parallel commands before allowing the script to continue.
If you need to start more parallel commands than the script limit allows, modify the script to invoke multiple scripts in parallel, each of which can start multiple parallel commands, up to the script limit.