its just info reader software.
with it u can read info firmware version sp lock stuts and *.ask of bb5 phone.
for connecting phone your phone at pc shute mode and nokia connecting cable driver must be installed you should use DKU2 OR any usb cable which detect phone and ask phone driver.not usb to serial cable.

people who want to convert there n73 to ME (music edition)
just need to update there firmware can be done with online with NSU (nokia software updator) or box like jaf ufs mt box with cable

flashing and unlocking is alwase risk to make phone dead or damage.

best regards
oh raja