I have a window that opens up in my application that I want the user to interact with. How do you make it so that user must close this window before he can do anything else? I believe they call it modal.

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If you want to make a window modal, then check out the - (int)runModalForWindow:(General/NSWindow *)aWindow General/NSApplication method. However, this method will only stop the user from interacting with any other window in your application. It’s not very OS X friendly to keep the user from interacting with other applications. – General/RyanBates

Thanks Ryan, that will be good enough for my purposes.