Currently Being ModeratedFeb 1, 2013 2:01 PM (in response to Halstein)
The default location of the Domain.sites2 file is shown here...
Move a copy of this file to the equivalent location on the other Mac.
See this page for how to expose the user library and open a Domain file when using Lion/Mountain Lion...
Currently Being ModeratedFeb 2, 2013 4:36 AM (in response to Roddy)
Thank you Roddy and Wyodor. Case solved - iWeb works as expected on another Mac. Sorry for not telling the version details here (iWeb '09 / 3.0.4 in OS 10.8.2) - but the link http://www.iwebformusicians.com/iWeb/mountain-lion.html was happily updated (have visited this site earlier with older OS at hand). Another link I stumbled into about using a common iWeb site on two (or more) machines was: http://www.macworld.com/article/1140154/iWeb_From_Two_Macs.html Not tested yet....
Again, thanks for helping.