Is there some way to trigger adding a specific product to an open cart?

[David R]

Judging from http://www.thatsoftwareguy.com/zenca...o_bonanza.html it seems the majority of what you've said is indeed available with his plugins. Which specific feature is missing? Perhaps it's more prudent to supplement with something that specifically handles the missing requirement than writing everything from scratch.

Thanks Dr. Byte, I thought so, too. But we corresponded about it a bit, and the upshot is that nothing he's currently got will address these things:
a) add a product "Y" to the cart when two products of some type are purchased
b) remove an item from the cart if the buyer changes cart contents and no longer qualifies.

Do you know if anyone ever pushed that tutorial example far enough to know it will work? Has something in the 1.5x generation of Zen Cart made it not a good option?

Thanks again,