Why do we need to create DTR client

Can any one give me some info why DTR client are needed when working with JDI. Because, In NWDI we dont need them...But, now I am workign on older version JDI.. So, can anyone let me know.

<a href="http://help.sap.com/saphelp_nw04/helpdata/en/83/74c4ce0ed93b4abc6144aafaa1130f/content.htm">This</a> might give you some help you require.
Regards,
Shubhadip

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