Forum Moderators: open
Uniform Resource Locators (URL) [rfc-editor.org]
Uniform Resource Identifiers (URI): Generic Syntax [rfc-editor.org]
And from Microsoft (MSDN) [msdn.microsoft.com]
I believe the apostrophe would be replaced by encoding symbols in the URL the same way spaces are. Maybe there's a workaround using mod_rewrite, but Google didn't show any apostrophes in a inurl search when I looked.