The basic invention is to define the TBD data structure in the driver layer to be exactly the same as the pointer structure in the TCB fragment structure and to have the TBD pointer in the TxCB point to the TCB fragment structure which is in protocol space. Also, the driver must ...http://www.google.com.au/patents/US5729681?utm_source=gb-gplus-sharePatent US5729681 - Method of communicating data from a host to a network controller