This user manual provides instructions for installing and using the HiPath 3000/5000 optiClient 130 software version 4.0. It includes sections on installation, initial configuration, logging in, the different user interface modes of optiClient phone, office and easyCom, making and receiving calls, using the telephone directory and call lists. The manual contains safety information and warns that unauthorized use of the telecommunications system is illegal. It also notes the user is responsible for establishing security practices to prevent unauthorized use.