Load Lamentation Sword on two or machines, start a network server (LAN) game on one machine and join the game on the other pc.The server has to be in the game !

Second machine:
Let's Say you want to have LOTS of money, drop all the money you have and crash the game (CTRL+ESC), now re-enter the game. You still have what you had before, and the item that you dropped!. In order to repeat this process you have to exit the game normally, do this over and over, you'll see.