Post Textarea -- where is the code for this ?

I am just making a small script to share with the community, and would like to know which file contains the STANDARD textarea for making a post ?
I then need to copy that file to my cutom themes so I can do some testing and then release the code on here....
I then need to copy that file to my cutom themes so I can do some testing and then release the code on here....
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Answers
BeforeFormInputs BeforeBodyInput DiscussionFormOptions
BeforeBodyField AfterBodyField BeforeFormButtons AfterFormButtons
grep is your friend.