OK, I think I found the answer. First off there is no such thing a an XMLHttpRequest, that's just the name of the object, and from what I've read in one of my books (Ajax, Your visual blueprint for creating rich Internet applications) an Ajax request is an http request, so if that is the case then the number of simultaneous requests with Ajax to cfc's are limited by the setting "Maximum number of simultaneous CFC function requests". If anyone thinks different, please let me know. thanks.
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