losing an FTP connection

     A quick question for which my quick search of the archives & IBM 
     publications turned up no answer.  I probably missed it, but I am 
     pressed for time.
     
     If an FTP is started from a 400 and during the transfer, the 
     connection is lost, will the destination receive part of the data or 
     none?  
     
     We have people who believe the entire FTP is buffered and if the 
     connection is lost, then nothing is sent.  We have people who believe 
     that the data is buffered into smaller subsets (say, packets, perhaps) 
     and sent as each subset is filled, so that if the connection is lost, 
     the destination will recieve whatever subsets have been transmitted 
     until the time the connection was lost.  And we have people who 
     believe the data is 'streamed' and if the connection is lost, the 
     destination receives whatever has been sent to the point so that even 
     a single record can arrive incomplete.
     
     Thanks for any help.
     jw
     
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