instead of creating the profile.xml in the program
directory, it should be stored in the user profile.
Windows: UserDir/Application Data/FullSync
Mac?... i guess HomeDir too?
ah well, that will need some further research :D (hints?)
Logged In: YES
Mac: yes, just like any other *nix: would create ~/.FullSync and place (configuration) files inside. If there is only one (text/xml) file, placing it directly under ~/.FullSync would be OK, too.