ttc is a program for manipulating targets from a host. It provides similar functionality to TCF in eclipse or adb in Android. With this tool you can build software for a particular target, install it on the target, reboot the target, and otherwise control operation of the target.
The name "ttc" originally comes from "Tim's target control". It was originally named just "target", and then "tc", but both of those had name collisions with already-existing tools.
The ttc usage manual is here: Target Control Usage Guide