How to use two USB blaster cable in the same computer

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Yes， you are right. Unfortunately, my supplier makes all USB blasters with a same ID:(.

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That doesn't matter. You can use FT_PROG to read the USB-Blaster EEPROM, save it to a template, and then re-write the EEPROMs with new serial numbers. You can even write your name in there if you want, eg., JERRY00, JERRY01, etc.

Here's the FTDI application:

http://www.ftdichip.com/support/utilities.htm#ft_prog

Cheers,

Dave