I imported a WSDL doc into Salesforce from a partner of ours, it created 2 classes, for example, one named Xyz and another called AsyncXyz.  I don't find a reference for AsyncXyz anywhere in the rest of the code that was created or the WSDL - it doesn't appear to be called.  One of the methods in AsyncXyz is a WebService which has similar content to the WebService in the Xyz class.  Does SF always create an Asnyc version for WSDLs? I've been an Admin for quite a while, but I'm fairly new to the SF Dev world and want to learn.