IMac5,1 mirroring possible via minidisplay port?

Hi there,
I have an old iMac 5,1 2006 and a macBook pro 5,5.
Can I mirror the macbook screen onto the iMac? The  thunderbolt cable I bought for this purpose doesn't fit the minidisplay port on the iMac.
Any workarounds?
Thanks

I don't recall a name, I'm afraid. There's a software product, however, called ScreenRecycler.

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