Hi Pascal,

> i never thought about the same-origin-policy, so i'll try to solve this
> problem. 
> So with the xmlHttpRequests, i only can call WebServices when my
> qooxdoo-application is on the same host, protocol and port? puh...

With recent additions to XHR, in fact, you can do cross-origin requests in most 
browsers, but the server needs to opt in by setting specific headers.

https://developer.mozilla.org/En/HTTP_access_control
http://caniuse.com/#search=xhr
http://bugzilla.qooxdoo.org/show_bug.cgi?id=5209

Another approach is using JSONP, as offered by qx.io.request.Jsonp.

Tristan

PS:
By the way, please avoid w3schools. There are much better docs out there! For 
instance, take a look at the Mozilla Developer Network.
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