Question about EV2300 and EV2400 of bq27621EVM

Please let me know about two point below of EV2300 and EV2400.

・Is EV2300/EV2400 needed to move bq27621EVM?

If EV2300/EV2400 isn't used, bq27621EVM can move an easy monitor, is it right?

・Customer using Windows7 32bit OS.

Which is most suitable for OS, EV2300 or EV2400?

（Windows XP：EV2300 , Windows 7 64bit：EV2400 , Windows 7 32bit：No information）

Best regards,

Satoshi