The Quick Reference Guide

Is there much of a difference between the quick reference guide to the dsm 4 and the dsm 4 itself?

I need to get a copy now, and i’m wondering how important it is to get the full text right now or can i put it off and get the quick reference. what will i be missing?

It depends on your need for detailed lower level information. The quick guide will provide you with the basics. However, detailed information, such as severity degree and relationships to other dysfunctions, may be incomplete.

Persona 3 – Burn My Dread -Last Battle-

The Western Wall

What is virtual concatenation in reference to a network?

This term is used in SDH(Syncronous Digital Hierarchy) & SONET (Syncronous Optical Network) topologies.
Virtual concatenation (VCAT) is an inverse multiplexing technique used to split SONET/SDH bandwidth into logical groups, which may be transported or routed independently. Alternate SONET/SDH concatenation techniques include: (i) contiguous concatenation and (ii) arbitrary concatenation.

Virtual concatenation is considered the primary enhancement to voice optimized SONET, in order to support the transport of variable bit data streams.

Gale Virtual Reference Library screencast