Difference between 3.0 and 4.0(technically)

Hi Guys,

I want to know the technical difefrence in 3.0 and 4.0.

Can anyany suggest me any link, where I find something.

As far as i get, 2 difference:

  1. Reverse Engineering in 4.0, which is not earlier in3.0

  2. Rec id in 4.0 is independent of table id’s .That is, we can find unique record in 4.0 from any table only on the basis of recid.In 3.0, recid may be same in different tables.So we have to use table id’s and rec id’s both to find the unique record.

am I right??

thanks in advance…