A project was carried out at The National Institute of Standards and Technology (NIST) to study the feasibility of developing a new generation, multiroom, compartment fire model computer code, called the Consoligated Compartment Fire Model (CCFM) computer code. The idea was that such a code would consolidate past progress in zone type compartment fire modeling, and allow readily for integration of future advances with the greatest possible flexibility. The project lead to the development of a protoype multiroom CCFM product called CCFM.VENTS. This is Part IV of a four-part report which documents the above effort. The main objective of this Part IV document is to document the use of CCFM.VENTS. Its capabilities and limitations are described. A simple two room tutorial is presented to get the user quickly acquainted with the input requirements of CCFM.VENTS. Each CCFM.VENTS command is described. Finnaly, a program for plotting CCFM.VENTS data is presented. This program runs on an IBM-PC or compatibles with a VGA graphics monitor. The other three parts of this report are: Part I: Technical Basis; Part II: Programmers Reference Guide and; Part III: Catalog of Algorithms and Subroutines.