In most cases a developer tool meant for PC based browsers with HTML, Java and JavaScript capabilities cannot be used for developing WAP applications. However, more and more developer tools are including WML support.
 
Allair's Cold Fusion 4.5 and HomeSite has some WML support, although it is clear that Allair could perhaps have put some more effort into clearing the bugs before releasing. Note that PHP and ASP is supported in Coldfusion/HomeSite, which we like. Also, be sure to check out Marjolei Katsma's HomeSite Help site for lots of information regarding Coldfusion/HomeSite.