Drawing lines between windows, as in the Builder interface

Question

I have two windows, each of which has a round NSView:

------------------     ------------
|X-+ Oscillator  |     |X-+ Mixer |
|----------------|     |----------|
|                |     |          |
|        O       |     |     O    |
|                |     |          |
|                |     |          |
------------------     ------------

Both windows are in a separate NIB. I want to be able to draw a line between two rounds NSViewat runtime using drag'n'drop, just like connecting IBOutlets in Interface Builder:

------------------     ------------
|X-+ Oscillator  |     |X-+ Mixer |
|----------------|     |----------|
|                |     |          |
|        O-------+-----+-----O    |
|                |     |          |
|                |     |          |
------------------     ------------

I also want to be able to determine which one is NSViewconnected NSViewusing the drawn lines. I need this to connect the oscillators to the mixers. I also want to delete the deleted connections by dragging them to the empty space.

Can someone explain to me how to do this? Thank.

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