From the NannyMUD documentation

LAST CHANGE

2000-12-16

TOPIC

NAME
        blocker - The block tool manual.


LOCATION
	/secure/blocker.c

AVAILABILITY
        All wizards can clone this.

DESCRIPTION
        The blocker was created by Qqqq. It has been superseeded by
	the Ignore command.
	
	The Blocker lets you block everyone but superiors, it also lets you
	choose who to block or who not to block.

	This object is autoloading and needs no activation. To deactivate it
	simply, destruct the object (brutal), or just do 'Set 0 0 0' (Nice
	way).

	To use blocker you need to have a closed dir in your main
	directory. To create that, do 'cd' and then 'mkdir closed' if you
	don't have one. (See the Note at the end of this document)

	COMMANDS
	Save 	This will save your settings.
	Load    This will load all your previously saved settings.

	Set [level] [trace block bag unknown]
		This is sort of the magic function that does everything.
		Here you either set the minimum-level of those you want to
		listen to, or you set three things at once:

		Trace <0/1>	0 is disabled, 1 is enabled. This Will let
				you  trace who said something to you.

		Block <0/1/2>	0 is disabled.
				1 is letting you block all but your friends
				(explained more in Blocked)
				2 is blocking your enemies, only.
				With both 1 and 2 you will block out all who
				is below the level you have Set.

		Bag <0/1/2>	0 is disabled, 1 writes everything that is
				blocked to the file ~/closed/bag.log.
				2 writes everything you see on your screen
				to the file ~/closed/last.log. This can
				only be used by 30++.
				Please try and remove the files now and then,
				or irate admin will contact you.

                Unknown <0/1>   0 means you will not block text that has no
                                detectable origin, 1 means you will.  An
				example of this is a message from your wizmod.

		If you don't give any argument to Set it will return the
                status of the blocker.

		EXAMPLE
		Set 1 0 0 0	This will now let you enable trace and disable
                                block and bag.
		Set 20		This will make you block all below level 20,
				whenever you enable the blocker.
		Set 0 2 1 0	Now you will stop tracing and  block and bag 
		                everything anyone below level 20 and what
				your enemies says/shouts/etc.
				

		Blocked ARG	If ARG is given then it will show all your
				enemies otherwise it will show all your
				friends (Hey how about that!). Your friends
				is people who shall be able to tell/shout/etc
				you stuff even if your Block is 1. You
				enemies, people who bother you, will be
				blocked out if you set Block to 2,
				and everyone else can tell/shout/etc. to you.

		Add NAME	Will add a person to your friends list.

		AddN NAME	Will add a person to your enemy list.

		Sub NAME	Will remove a person from your friends list.

		SubN NAME	Will remove a person from your enemy list.

	NOTE
	When you first clone the blocker, you need to follow a few simple
	instructions.

		mkdir ~/closed
		edac ~/closed /local/q:ALL
		edac ~/closed /secure/blocker:ALL
		edac ~/closed $REST:NONE
		Save

	Doing this will initialize your blocker and give it the appropriate
	file-permissions on the directory it works in.