Business data tool set

Hi all,

Can anyone give me any sight on what BDT is , where is it used and what is the role of the developer in this ?

I know the prerequisite is ABAP programming knowledge an Dialog programming.

I did find couple of docs on SDN and from http://www.sapdevelopment.co.uk/enhance/bdt/bdthome.htm .

Just wondering if I can get any doc kind of thing which explains me in detail.

Can anyone help me out with this.

Thanks,

Daniel.