Seed Viability and Zel Tol

I planted some seeds that were given to me about 4 years ago and which I  thought I had lost. I planted about 50 of them and many have germinated. They were in manila envelopes and had been in room temps (I guess) for the four years from when I received them.
I know there was at one time a lot of conversation about keeping seeds--freezing, refrigeration, etc.
What is the latest thinking on the better ways to keep seeds viable? Does it depend upon the plant from which we get the seed?

Is Zel Tol (I am not sure I am spelling this correctly) , the nematicide (?) that is written about in the recent  Tri-State and New England newsletters, available at some popular garden centers or does one order it?

---Clyde Crockett
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