 special syntax to access internal elements in the lignes: <B>£</B>n<B>c</B>, <B>£</B>n<B>a</B>, <B>£</B>n<B>b</B>,<B> £</B>n<B>i</B>... See <A HREF="#Lsyntax">here</A> for a complete description.<BR><BR>

The other one is used to define dynamic segments, that is: segment automatically generated and updated by the tool from two points. Let's say that points <B>A</B> and<B> B</B> are displayed; you can ask to see <B>A-B</B>. Now, if you select A with the mouse then move it somewhere else, you'll see that