Hi Ton,
>> I want to add a css file (or is there a better way) to the generated help pages for the webservice methods.
Adding your own CSS files to the system is recommended and probably some thing that most apps have done. It's so common that the wizard even includes one for you <g>.
Typically css files are added not via embed code, but via the web server prcoedure, nettalk extension, styles / files tab.
>> I think I've found it, the served page uses a "?c=1" tag/attribute/parameter (?), when I remove this, the stylesheet file was applied !
yes, but this is a red herring. (The c=1 parameter is a technique to force the browser to ask the server for the file in case it has changed. But in this case it is _server side_ caching, not _client side_ caching which was your root problem, so which _changing_ this parameter has the side effect of fetching the new file, that's an accident, not by design.)
So the real issue is that you had server-side caching on while you were editing javascript or css files. It's recommended that while editing these files you click the "debug" button on the Web Server procedure, NetTalk Extension, Performance tab. This turns off all caching to make things easier.
Once editing is done you can switch it back to high performance (and run gzipall at this point as well.)
Cheers
Bruce