NAME CLIENT VAL1 VAL2 VAL3
aa   bb       4   4    5
aa   cc       4   4    5
Second File
aa   bb       4   4    5.34
aa   dd       4   4    4.05
THird File
aa   bb       4   4    5.34
aa   dd       4.1  4.3    4.05
aa   ff       4.3   0    3.4

##</code><code>##

NAME CLIENT VAL1 VAL2 VAL3
aa  bb      <sum from allfiles> <sum from all files> <do>
aa cc        -------- do -----------
aa dd        -------  do ----------