[Koha] member flag confuse

[rahayu rms]

Hi,

I am confused on how to determine level for user acess?For example
V1000001-member flag ->circulate
V1000002-member flag ->borrow

When I checked in borrowers table, it shows

Cardnumber   Flags
V1000001        2->what does it mean?
V1000002        128->what does it mean?
If flags in borrowers table is null, does it mean the person can acess all 
librarian function?

2. How many books for each person can borrow defend on category of user.Can 
Koha determine how many book for each borrower can borrow automatically?

I am using koha v1.2.3 on windows.

Thanks

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