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Do you know of a client-side application able to read/write to stackexchange sites?
Something like the applications that interact with Twitter using curl. Do you know of a similar script or application?
There is a Stack Exchange API, you should have a look there. The various applications already developed using the API can be found on stackapps.com.
If I remember correctly, the API does not allow you to write, only read but you should have a look in case you find anything helpful.