This will add a single wiki page to the current folder. You may want to "Add ZWiki" instead, to get a more complete wiki with sample content and fuzzy url handling.
Use capitalization, non-ascii characters, whitespace and punctuation if you wish. The traditional WikiNames are also a good choice. A url-safe page id will be chosen automatically. Tip: if you need to rename your page later, use Zwiki's rename feature; changing wiki page titles or ids directly with the ZMI may confuse Zwiki.