Juniper

EX Switches

Semi-hidden interfaces

lcdd: Line Card Daemon

"lcdd" from a shell (not the cli) connects you to various other parts of the switch,
including the software forwarding infrastructure (sfid), chassis manager (chassism),
and the virtual chassis system (vccp). You don't need to be root to get into these.
The general idea is:

 > lcdd 0 <area>

Where area is one of the above/below items. The digit (0) is the FPC slot number. EX switches only have FPC0.