String vs CString Source differences

Hey there,
currently trying to make a "proper base source" form a few released ones out there, for testing different things. Ketchup's (Other forum) and Blouflash's for those interested in the particular sources.

Within the "Script.cpp & Script.h"

Lot's of differences like where it's "string" in one source and "CString" in another one, duo to my lack of programming skills, it doesn't make much sense.
My question is, what's the difference between those? I would guess, it doesn't really matter, since the sources work and no complications appear?

Few examples:

Code:

	static map<string, int>		m_defines;
	static map<string, string>	m_mapString;


	static map<CString, int>		m_defines;
	static map<CString,CString>		m_mapString;

Code:

		bool bResult = m_mapString.insert( map<string, string>::value_type( (LPCTSTR)str, (LPCTSTR)Token ) ).second;


		bool bResult = m_mapString.insert( map<CString, CString>::value_type( (LPCTSTR)str, (LPCTSTR)Token ) ).second;

Code:

	CScanner::GetToken( FALSE );
	string str = token;
	CScanner::GetToken( FALSE );


	CScanner::GetToken( FALSE );
	CString str = token;
	CScanner::GetToken( FALSE );