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The only viable way to share data between seperate clients is to use the messaging system, such as whispers, say-commands, emotes or chat channels.
Many add-ons, when installed, create or join a silent chat channel (a silent channel is one which is not bound to any of your chat frames). Then, the add-on registers for CHAT_MSG_CHANNEL event for itself, and looks at the 'arg9' variable, which contains the channel name. If a channel name match is made, the contents of the message is readed and interpreted, otherwise it's skipped.
If you don't feel like rewriting from scratch, there's always the SkyLight library, a rewrite of the original bloated Sky library. I'm told it works smoothly, but being a naturally suspective person, I'd still implement my own method if I needed to exchange data between clients.
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