It seems that I am having a problem with the canon's program for using the canon scanner. A strange problem. I open the program(not quite sure if this is 'driver'), I make scans, I quit it. Then, when I try to open it once again, I get a message 'failed to load driver'. The only way to run it again, is restarting the whole mac osx. I have leopard, I installed latest versions of canon applications. The reason I post such a question here is that I am suspect that something like a process do not work well. I suppose that maybe, if I could know which process is still running after quiting the application, I could kill it and run it properly. I have bad experience posting questions to several companies helpdesks, so this would be a generic but effective solution if I am right. Just avoiding restarting mac (not these 'windows' stories again) and make the program run. How can I find which services are 'attached' or called or used by an .app application? Application monitor is so useful. I can see the application. But if i list all processes the how can I say if a specific process stuck my scanner? I am waiting your help.