it is possible to make an autotalker, or a chat bot if you will. I actually made a fully functional one in boi that was pretty sweet.
First, you need to find the chat addy in boi. Switch to normal chat and in CE, search the last thing a person said. so:
Bob : yea, that was fun
search as text in CE for "yea, that was fun"
you'll get like 5-7 hits or so
then just look at the addys, they should change everytime a new message, or system message, appears.
now the chat format is kinda funny, it's like this:
[img=411][url=341234}Bob[/url] : yea, that was funny
or something super similiar to that. once you find the correct addy that changes, add it to the CE Address list, rightclick it and click "browse this memory region". From there, look where the start of the chat message is (using the example above, you'll look for the [img=411] part), rightclick on the very start ([) and add the addy to the chat list.
And there you go, you have the chat addy. You can make a program that can filter the messages, the img=411 part has a different number if it's guild, party, nearby, world, etc. message. so just modify it as need be. Then, to make an autotalker, or w.e., just have your bot to read chat constantly, once it sees a keyword popup, have it reply or what not.