**orbint**integrates orbits from given initial conditions. If the input orbit has more than 1 step, the last step is taken as the initial conditions. Although the`potname=, potpars=, potfile=`keywords can be given, if the input orbit contains...**perorb**finds periodic orbits, and stores a full period which should close the orbit. This program finds periodic orbits in the XY plane (i.e. currently it will only find 2D orbits) by searching for the centers of invariant curves in the surface of section.**henyey**also finds periodic orbits, but uses Henyey's method^{5.14}. This program has however not been released to the public version of NEMO.

(c) Peter Teuben