[TYPO3] how to pre/postproces the form-fields from alt_doc.php?

[krassimir berov]

May be I was not clear or I asked my question wrong  :-/ 
  Concerning 
  TYPO3-english Digest, Vol 31, Issue 22
 
 1. how to modify the content of a dropdown menu in the backend
      comming from my custom table (krassimir berov)

Let me state it differently...
How could I preprocess/postprocess the content of a field in the edit form
Displayed by alt_doc.php
Hot to do this in my own extension. Suppose I want to check what the user entered.

Any Help???
Thanks in advance


 

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-----K.Berov
		
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