If multiple versions of a topic exists, you can find the disambiguator in the upper right hand corner of the topic.    From Wordnik.com.  [MSDN Blogs] Reference

The definition, in particular, wouldn't move; I kept getting error messages that it already existed (with the disambiguator) but, as far as I could tell, it did not.    From Wordnik.com.  [Citizendium, the Citizens' Compendium - Recent changes [en]] Reference

Move the (article) (and talk page) to (article) (name) (disambiguator).    From Wordnik.com.  [Citizendium, the Citizens' Compendium - Recent changes [en]] Reference