Hearse is a program that exchanges bones files. It is to be run after NetHack has left a bones file, and it will connect to a central server. If Hearse finds that the local copy of NetHack contains new bones files it will upload them to the server and download random bones files of the same dungeon level. It is even possible to receive bones files that originated from the connecting computer.
The Windows version of Hearse and other versions are not the same. The configuration file for the Windows version allows for up to five extra bones files to be downloaded if you are running short of bones. This way you will never have to play a bones-less game.
You can read more at the hearse homepage.