Hi Hung,
mainboard information is normally not presented by any API calls. 'API' means 'Application Program Interface' - that is the Interface between Windows and your application. Partially, Windows does know about some hardware things and stores them away in fixed places of 'low memory' but for most other information you have to write your own routines which are difficult to write because, while Windows is running it's detecting any violation of protected memory space. You cannot access any other addresses in RAM than those where your application is running! I think, Al's solution is a great one otherwise you'd have to spend a year on such a program.
Best regards,
Guenter
BTW: It would be nice to know your full name and the area where you're living/working. Thank you!