An Adder User Station connect a Screen, Keyboard and Mouse that allows someone to use a particular computer System or Systems over a catx cable or via a KVM switch.

The Adder X200 is a USB keyboard, video and mouse KVM receiver.

This USB KVM receiver has been designed for use in applications where up to two computers can have their keyboard, video and mouse control extended up to 300 m across CAT5 or higher UTP cable. The AdderLink X200 provides absolute real time keyboard and mouse performance along with hi-definition, hi-resolution video over a VGA interface. The AdderLink X200 receiver can also be used as a remote user station for the AdderView CATx range of KVM switches.

AdderView DDX-USR is a user station (receiver) for Adders new high performance DDX KVM Matrix

It provides powerful functionality inside a small, compact form factor. Combining Adder's trusted KVM extension technology with flexi-port switching capability, DDX30 & DDX10 enables multiple users to access groups of computers located safely and securely inside your server room. The user station can be placed up to 50m from the DDX30 or DDX10 Switch.