Questions on IP Address policies

If this list is not the correct place to ask these questions, please accept 
my apology for the inconvenience.  If you could direct me to the correct 
person or list to ask, I would greatly appreciate it.

If a company "owned" (or had been allotted) a class B since the early 90's, 
how is this classified by ARIN?

Is it assigned to the company (as an end user organization) or is it 
allocated to the company (as an ISP org for furthur suballocation)?  Or does 
it not fall into neither of these categories since the allocation occurred 
before the current SWIP (allocation) policies were instituted.

In either case, if the company wanted to start sub-allocating (or assigning) 
these addresses to its customers, would it be able to do so without 
reclassifying the space?

When does (if at all) ARIN consider taking space back from an organization?

If the company assigns a subnet of its Class B to one of its customers, and 
the customer multi-homes with another ISP, will his subnet be diversly 
reachable through both the company's network and the other ISP whom he is 
multi-homed with?  In other words, will the Internet routing community 
advertise and accept routes that represent a partial Class B network.

FYI:  When I say a CLASS B network, I am speaking of a CLASS B network and 
not just a /16 CLASS B equivalent.

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