I mean, the BL_IDs are binded via email address, not computer screens, since Badspot has a BL_ID recovery page for people who forgot their BL_IDs, as they can submit their email address to to get their BL_IDs back, provided that the email address used WAS used to register a BL_ID, and that BL_ID is still usable.
On a side note here, DrHitiusSir makes me think of Samy from Amy's Baking Company.