When a person reminisces about or uses things from the past, could also be seen as nostalgiafagging.
Jane: I'm using Windows Vista on my computer. I miss when operating systems used to actually be good and have nice design, everything is so boring now.
Karl: Hey guys look at Jane, she's once again waybacking again.
n. software that is no longer sold or supported by the original publisher / developer, often found as free downloads on the internet because it cannot be obtained elsewhere. Not legal, but often seen as morally acceptable because the company that made it is no longer selling the title, nor releasing it as freeware, therefore abandonware is "keeping the gamealive", so to speak.
Doom II is not abandonware because idstill sells it, while The Incredible Machine is not sold, therefore is abandonware.