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Best way to implement calling another controller/class?

I'm trying to determine what would be the best way to implement some functionality in one of my programs. My program has three class controllers. One operates the functionality of the window and which tab window should be in front. Then I have two other class controllers which manage the functionality of each of the tabbed windows.

I want to be able to drop files onto my application, and the window controller will take in the files, decide what to do with them, and then send them off to the proper controller. Will I need to call a new class instance, or can I send the information some other way, or perhaps just make the information global between all three of the classes?

Here is a general idea in what I'm trying to do.

- (BOOL) application:(NSApplication *)theApplication openFile:(NSString *)filename
{
if (some_case)
{
// call one controller class and send file name(s)
}
else
{
// call the other controller class and send file name(s)
}
return NO;
}

Chad Armstrong
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