http://www.amxmodx.org/doc/source/commands/cmds.htm
Scroll down until you see "amx_csay".
An example:
amx_csay red The soandso clan is recruiting!
Additionally look in your amxx.cfg and look for "amx_scrollmsg" and
"amx_imessage".
Using these you'll be able to display hud messages without any scripting.
amx_scrollmsg I believe will display scrolling text on a regular interval
on the bottom of the player's screen.
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