From Tapestries MUCK
The @set command is used to set props on yourself, an action, an object, or a room. It can be as simple as @set me=sex:male or as complex as @set me=_example/somelist#/1:new text for line 1 of a list. The syntax is simply @set <A player, an object, a room, or an action>=<What you want set>:<the value you want set>. It's also used for setting things like chown_ok and link_ok.