year end payroll patches

HI All,
   
  Anybody aware why we will have year end pay roll patches every (may be  a 
quarter patches). functionlally what do they do.
   
  i got the message below from my client to apply them. not sure what do they 
mean exactly.
   
  2007 US Payroll Year End Phase 2 incl 4Q 07 & Year Begin 2008 Patch 6281324 
CONSOLIDATED EXTERNAL BUGS PATCH FOR AUGUST 2007 Vertex Payroll Tax Q Series.
   
  can some one help me interpreting.
   
  Thanks,
  cv

       
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