ns_atclose - Queue a script to run after the current connection is closed
This command queues a script to run after the current connection is closed. The script and optional arg are concatenated together and added to the list of at-close callbacks. The scripts are executed in the global scope in LIFO (last in, first out) order.
When the optional arguments are provided, these are added to the command script to be executed. Therefore, two invocation styles are supported: either providing a script, or a command with additional arguments.
ns_atclose, ns_atexit, ns_atshutdown, ns_atsignal