You can can it for whatever you want. The external_id is just a string. You can use it to store an ID number or similar from a different system so you can find it again later.
Add comment to object
I have a service that create comments in items. Int the Podio API Documentation, the request for Add Comment, there is a field name "external_id". But, I didn't understand how can I use this. "External_id" of what?
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great! It's only for my own control.
Can I create a comment by API simulating a User?
You cannot simulate other users (that would be quite a security issue). You can only add comments as the user you are currently authenticated as (or as the app if you authenticate via app authentication)
thank you for your reply.
I would like of insert comments in HTML mode, it's possible?
We don't allow HTML in comments, but you can use Markdown. See syntax: http://daringfireball.net/projects/markdown/syntax