The 2^256 Deep Space Vagabond program does use your CPU and yes it works like vanity address finder accept in continually creates more and more addresses and checks them against a known list of lost Bitcoin addresses that have bitcoins on them, but like everyone has said in this thread the possibility of finding a single one is so infinitely small it would not be worth even trying.

The likelihood is so small that if you put every single computer on the entire earth that has ever been produced, took all of the individual computer parts that are not in computers and built computers from them, added in all of the super computers and servers, cell phones, iPads, tablets, nooks, kindles, gaming consoles, and every other digital device that could ever possibly calculate a Bitcoin ECDSA key pair and perform SHA256/RIPEMD160 functions on the keys, it would take longer than the universe has been around to generate all of the possible keys.