TUTORIAL PACKAGE FOR THE CTSCREEN MODEL

                                   READ.TXT

     The CTSCREEN tutorial files are part of the "Instructional Package on
Regulatory Air Quality Modeling - Part II:  Tutorials for Five PC-Based Air
Quality Models and Two Utility Programs," EPA-454/C-92-003.  It contains
instructional materials for the CTSCREEN model.

     The CTSCREEN tutorial contains the following files:

     (1) CTSCRND.ZIP - CTSCREEN demonstration
     (2) EXES1.EXE - CTSCREEN model (self-extracting), file 1
     (3) EXES2.EXE - CTSCREEN model (self-extracting), file 2
     (4) FILES.EXE - Text editor file (self-extracting)
     (5) TERRAIN.EXE - Terrain data file (self-extracting)
     (6) BUCKBERG.XY - Terrain data file
     (7) ORIG.XY - Terrain data file
     (8) CTDM.BAT - CTDM batch file
     (9) CTSCRTUT.ZIP - Tutorial documentation in WP51
    (10) READ.TXT - Instructions on CTSCREEN tutorial.

     In order to execute the CTSCREEN tutorial, all of the files listed above
must be downloaded and stored in the same DOS directory (i.e., C:\CTDM) in the
following manner:

     (1) \CTDM\ subdirectory:  CTDM.BAT, CTSCRND.ZIP, READ.TXT
     (2) \CTDM\EXE\ subdirectory:  EXES1.EXE, EXES2.EXE
     (3) \CTDM\FILES\ subdirectory:  FILES.EXE
     (4) \CTDM\TERRAIN\ subdirectory:  BUCKBERG.XY, ORIG.XY, TERRAIN.EXE


****  A hard copy of this file (for downloading purposes) is suggested.  ****


     All files with a "ZIP" extention name must then be unzipped (dearchived)
using the unzip program available for downloading from the System Utilities
menu of the TTN.  The unzip program "PKUNZIP.EXE" must also be stored in the
same DOS directory with the tutorial ZIP files.  Simply type PKUNZIP followed
by a space and the name of the ZIP file and the files included in the ZIP will
be generaged in your DOS directory.  After dearchiving all of the above files,
type CTSCRND to invoke the CTSCREEN demonstration.

     Files with the "WPF" extention name are in WordPerfect format and must
be imported into your WordPerfect word processor.  The original documentation
was formatted for an HP LaserJet II series printer.  The pagination of your
printed file may differ due to variations in printer and font types.

     Any questions or comments concerning the CTSCREEN tutorial may be directed
to Dennis Atkinson, U.S. EPA, MD-14, Research Triangle Park, N.C.  27711
or call (919) 541-0518.  Technical questions concerning the CTSCREEN model may
be directed to Desmond Bailey, U.S. EPA, MD-14, Research Triangle Park, N.C.
27711, or call (919) 541-5248.