BOSS: What is the difference between BOSS TONE CENTRAL (BTC), BOSS TONE STUDIO (BTS), and BOSS TONE EXCHANGE (BTX)?

Here is a brief explanation of the various different online services provided by BOSS:

BOSS TONE CENTRAL is a library service offering additional contents for BOSS products provided by BOSS
BOSS TONE STUDIO is a free downloadable editor/librarian software
BOSS TONE EXCHANGE is a Liveset sharing service for the global BOSS user community