This file help you to develop freeware modbus library (CModbus)
---------------------------------------------------------------

*-- Question 1 --:
My vc6 compiler occure this error message!
error C2065: '_beginthread' : undeclared identifier
error C2065: '_endthreadex' : undeclared identifier...

*-- Answer 1 --:
You have to change your project setting! 
Go to "project settings->C/C++->Code Generation->Runtime Library",
and exchange "single_threaded" for "multithreaded".

*-- Question 2 --:
My vc6 compiler occure this error message!
error C2065: 'UINT' : undeclared identifier...

*-- Answer 2 --:
Add this declaration un your header file!
#ifndef UINT
#define UINT unsigned int
#endif