
LJConfig allows you to easily modify the settings of supported HP LaserJet printers from your desktop across any sort of printer connection. It allows you to change the Lines Per Page, Control Panel Display, Density, Tray Locking, Fuser Temperature, EconoMode, REt, and Resolution settings.
LJConfig supports the following LaserJet printers: 
Some LaserJet 4s (4 Plus, 4Si, and some others)

LaserJet 5P, 5MP, 5L-FS, 5L Xtra

LaserJet 6P, 6MP, 6L, 6L Xtra

LaserJet 1100

LaserJet 1200/1220

LaserJet 2100/2200

LaserJet 3200

LaserJet 4000/4050/4100

LaserJet 5000

LaserJet 8000/8100/8150