Disk No: 1933                                                           
Disk Title: OLV312                                                      
PC-SIG Version: S1                                                      
                                                                        
Program Title: OLV312                                                   
Author Version: 3.12                                                    
Author Registration: $80.00                                             
Special Requirements: Other programming software and MicroSoft Link.    
                                                                        
OVL is a powerful overlay manager system for use with Microsoft LINK.   
Overlays are portions of program code which are loaded from disk into   
memory on an ``as-needed'' basis.  Overlays allow a very large program  
to use a relatively small amount of memory.                             
                                                                        
LINK.EXE, Microsoft's Overlay Linker, included with MS-DOS and Microsoft
languages, versions 3.x, 5.x, and some 2.x versions, allow creation of  
overlaid programs.  However, LINK only inserts software interrupts and  
some overlay information in the program for an overlay manager to use.  
LINK doesn't provide the actual code that loads the proper overlay from 
disk and passes control to it.  That's a job for an overlay manager, and
that's where the OVL overlay managers come in.                          
                                                                        
OVL "manages" overlays.  OVL loads overlays from disk at the appropriate
time and jumps program execution to the overlay code.  OVL managers been
tested with MASM 4.0 and 5.0; Turbo C 1.0, 1.5 and 2.0; QuickBASIC 4.0  
and 4.5; Microsoft's BASCOM 6.0; and Clipper (PRONK.EXE, an included    
support utility, must be used with Clipper programs).  Other languages  
that compile to standard Microsoft Overlay LINKable object modules MAY  
also work with OVL.                                                     
                                                                        
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