RedPower Control provides a means of controlling many RedPower & redstone components, meaning a much larger form of control for all of your systems. Contrary to what many people believe, RedPower Computers were what inspired ComputerCraft, and were in the making long before. In some cases, spawning components of RedPower Control in SMP can crash the client. The reason is unknown, but is a confirmed server issue, and not a client problem. It is not recommended to craft these in a project table when you do not know if the server is having this problem, as it may cause problems where you cannot open the table up again, requiring you to break it and put it back, dropping anything inside.