Online player detector

Online player detector
Name	Online player detector
Source Mod	TubeStuff
ID Name	Unknown
Type	Block
Stackable	Yes (64)
Solid	Yes
Transparent	No
Affected by Gravity	No
Emits Light	No
Flammable	No
Required Tool	Unknown

The online player detector is a block from TubeStuff that Turns green and emits a redstone signal when the player who placed it is online on the server or world. Although essentially useless in singleplayer, it can be used on larger multiplayer servers which require players to turn off their machines when offline, in order to reduce lag. It may also be used for other purposes, such as locking the player's house door while offline.

Recipe