3CHP.EXE replaces the existing 3.CHP in your MYM11 program directory.  It allows for the new Area codes to be used with CheckFree Merchants.
Install instructions.
1. Exit MYM11 entirely.
2. Download 3CHP.EXE into your MYM11 program directory, i.e. C:\MYM11 
3. Change directory into the MYM11 directory, i.e. CD \MYM11 <enter> 
4. Type 3CHP <enter>
A message will appear on the screen:
PKSFX (R)  FAST!!  Mini Self Extract Utility  Version 2.04c  12-28-92 Copr. 1989-1992 PKWARE Inc. All Rights Reserved.
PKSFX Reg. U.S. Pat. and Tm. Off.
Searching EXE: D:\MYM11\3CHP.EXE
PKSFX: Warning! 3.CHP already exists! Overwrite?
5. Type Y for yes to overwriting.
A brief message will appear on the screen:
Inflating: 3.CHP
The prompt will return and installation is finished.