Hi, At work we have 4 Macs. 2 oldish ones that are used for printing (G3+G4) and 2 newish ones (G5 PowerMac & Intel iMac). I use the iMac and my collegue uses the G5. I am having a problem at the moment where the applications he has installed on his computer are being listed on my computer as apps that can open. And yes, they do open when selected (since the problem arose some file types have defaulted themselves to PPC apps on his Mac which is highly annoying). We share all our hard drives on the computers and are connected to each other all the time , and this cannot change as we exchange a lot of files... but how can I stop "Application Sharing" ? I need to remove all traces of his Applications on my computer. NB : Another example is when i right click on a Html file, and go to Open With, I have options for Safari on my computer , and then an old version of Safari on his Mac. (He still uses Panther).