CRM Interactive Scripting : BDC zone

Hi experts,

I have several questions regards to BDC fiels in Interactive Scripting :

1- would someone confirm that the use of BDC fields is to import values in the script (ex : address) ?

2- what kind of values can be entered in a BDC field ? (ex: only BP fields ?)

3- how can I find the link in BDC field ? (ex : //currentContact/builStandardAddressRel/STREET)

4- Can I import in BDC field the name of the main contact of a BP (ticked as "standard" in the contact sheet) ?

Many thanks in advance,

Eli