SayHelp screen 5: Room and environmental settings.
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If <ch> is 'here', then you change the current room's defaults [if you own it].
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A environmental verb setting is only used in preference to a player's default
verb, but all environmental filters are applied to the player's speech after
personal filters.
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 Example: sayset here bubbles,       [ Example: underwater ]
          sayset +here bubble,
          sayfilter here fadd replace
          sayfilter here add able abubble
          "It's indescribable!
          Freda bubbles, "It's indescribabubble!"
          You bubble, "It's indescribabubble!"
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The Halt filter stops say climbing the environment for more filters.
Typical use is 'sayfilteryset here fadd Halt' after a room's filters.
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_listening and .broadcast are given an unsplit version of speech.
 You may inhibit say .broadcasting in the current room with 'sayset !broadcast'.
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 To add a local notification system. (Like couches), sayset notify dbref in
 a room or its environment. The dbref is to a program-object, with a
 template of ( "split-say" "unsplit-say" -- ), which should notify to the
 occupants of the room (including puppets and the room itself), depending
 upon the setting of each player's _say/normal? property. Normal is the
 unsplit version. If both are the same, you can do a notify_except for
 efficiency.
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sayhelp 5:rooms/envs  6:puppets  7,8,9:filter-writing  10:$verb  11:boringadmin