gistfile1.txt

- (void)applicationDidFinishLaunching:(NSNotification *)notification
{

    self.windows = [NSMutableArray new];

#ifndef DEBUG
    for (NSScreen *screen in [NSScreen screens]) {
        NSWindow *blockingWindow = [[NSWindow alloc] initWithContentRect:NSMakeRect(0, 0, [screen frame].size.width, [screen frame].size.height)
                                                               styleMask:NSBorderlessWindowMask
                                                                 backing:NSBackingStoreBuffered
                                                                   defer:YES
                                                                  screen:screen];
        blockingWindow.alphaValue = 0.75;
        blockingWindow.backgroundColor = [NSColor blackColor];
        blockingWindow.level = kCGPopUpMenuWindowLevel + 100;
        [blockingWindow makeKeyAndOrderFront:self];
        
        [self.windows addObject:blockingWindow];
    }
    
    // Capture displays (really black it out)
    if (CGCaptureAllDisplays() != kCGErrorSuccess) {
        NSLog(@"Couldn't capture displays!");
        // Note: you'll probably want to display a proper error dialog here
    }
#endif
    
    // Create the usage agreement window
    NSRect rect = [agreementView bounds];
    unsigned int stylemask = NSBorderlessWindowMask;
    
    agreementWindow = [[UsageAgreementWindow alloc] initWithContentRect:rect
                                                              styleMask:stylemask
                                                                backing:NSBackingStoreBuffered
                                                                  defer:NO ];
                                                                  
    [agreementWindow setLevel:CGShieldingWindowLevel()];
    [agreementWindow setHasShadow:YES];
    [agreementWindow center];
    [agreementWindow makeKeyAndOrderFront:nil];
    [NSApp activateIgnoringOtherApps:YES];

}

- (void)applicationWillTerminate:(NSNotification *)notification
{
    CGReleaseAllDisplays();
}