/facepalm
Try reading the posts after Taborious'.
Addon's have no connection to macros. If you want to trigger a macro, or send it values (like setting target or focus for it to work on), you need to send WoW a keypress. For that you will need to use a multiboxing program, because addons are not permitted in any way to pick targets or activate abilities.
If you're thinking of having Jamba-Macro rewrite macros on the fly, depending on what is sent through the channel, that is just too close to automation, regardless of how you use it. It's a very small step to go, from changing the healing macro to modify the target, based on which character is clicked on in the addon window, to changing the healing macro, based on the health the addon is reading for the character.
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