Function set_follow_string():
Defined in module m_follow (file: /std/modules/m_follow.c)

Set the names of the objects that the object will follow.
Allowable arguments are strings, objects or function pointers.
Strings must be an id of the object which you want to have 
followed.
If a function pointer is used it must return a string, object
or an array of objects and strings.  An argument of this_object
is passed to the function pointer.
