New answers tagged political-correctness
The usage of the "Binnen-I" in german spelling occured from the 1980ies (e.g. KollegInnen, MitarbeiterInnen). It is frequently used but similarly often it is rejected. These short forms are not consistent with present spelling rules where capitals within words are not allowed. Duden - Richtiges und gutes Deutsch, 6. Aufl. Mannheim 2007
Yes, this is the P.C. way, instead of using just "Besucher" (visitors), which traditionally encompassed both genders. Many people don't like it, but it's becoming more and more frequent. Personally I prefer "Besucher and Besucherinnen", instead of using the so-called Binnen-I.
You got it right - this form is called "Binnen-I", and it is used as a "neutral" form to cover both genders. It can be used generally in contexts where you are not bound to the "official" orthography rules, since it is not part of them.
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