To: autocompletion

the patch doesn't apply at all.
What is it supposed to do?
How?

to have a autocomplete msg_TO field, we need to create a function like this:
http://api.drupal.org/api/4.7/function/user_autocomplete ,
where we check at the same time if the user accepts messages.

http://api.drupal.org/api/HEAD/file/developer/topics/forms_api_reference... ,

One useability issue of the current module is that one can write a long private message, but only after submitting does one find out that the user we were writing to does not accept private messages.

Above patch seems to be for 4.6 and was submitted long ago, June 27, 2005.

Here's a working patch for current cvs version (4.7)

http://drupal.org/node/87004