Handle Class or Protocol Class

In Effective C++, 2nd Edition Scott Meyer tells two ways( i.e Handle Class and Prototcol Class) to minimise compilation dependencies between files(Item34). But I wanted to know when should I prefer one over other to reduce compilation dependencies? Should I always stick with Handle Class or should always stick with Protocol class? Are there any guidelines? [Edited by - TEUTON on September 11, 2006 9:41:49 PM]