is MC and MCBrowser sending event when a package is created?

Yes.

...

is it using/extending SystemChangeNotifier?

No. You register using #addDependent: to the class side of MCWorkingCopy.

Thanks! I will try. I would like to see if my packageOrganizer can be filled up automatically in parallel to packageInfo PackageOrganizer. But may be I will have to hack the system and override heavily some methods. :( We will have to fix that, uniformity is a cool property. I imagine that it will break a lot since we can call unload Do you know if when we send aWorkingCopy unload we get notified too? and notified of what because I saw unload -> unregister unregister self class registry removeKey: package. self class changed: #allManagers MCPackageManager seems full of code that we should remove :( I just checked and I saw that MCBrowser was hardcoding PackageInfo :( Because it would have been good to follow what roel started: Tools where dependent from systemNotifier, event the changeset Now lukas when people use Gofer to load a package, do the dependent of MCWorkingCopy gets notified? Stef