you can get a german description here
unitpath
first parameter: id of the unit that will follow the path
path paramters (1 to unlimited): ids of infos that you place along the path in the editor to define it.
the event "nodeXXXX" will be triggered at the unit when the unit reaches one of the infos (with XXXX being the info id, always 4 digits with leading zeros). "node0001" for an info with id 1 for instance.
also the event "reach" will be triggered at an info as soon as it is reached by the unit.