The Environment Manager (EM) is the part of VR Juggler that controls communications with the GUI program, VjControl. It also controls VR Juggler's performance monitoring capabilities.
The Environment Manager chunk, a singleton, allows the user to configure the network setup of a VR Juggler application (whether to accept connections or not, what network port to listen on, etc).
This chunk, also a singleton, allows you to turn VR Juggler's internal performance measurements on and off.
These chunks define data connections - files or sockets - that the EM can connect to. An EM Connection is created automatically whenever a VjControl process connects to a VR Juggler application. Another common use of EM Connections is to define an output file for VR Juggler performance data.