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  1  definition  found 
  From  The  Free  On-line  Dictionary  of  Computing  (13  Mar  01)  [foldoc]: 
    A  {utility}  program  to  ease  the 
  installation  of  another,  probably  larger,  {application}.  It 
  is  also  possible  for  {hardware}  to  have  an  installer  accompany 
  it  to  install  any  low  level  {device  drivers}  required. 
  The  installer  commonly  asks  the  user  to  enter  desired 
  configuration  options  for  the  main  program  or  hardware,  and 
  sets  up  various  initialisation  files  accordingly,  as  well  as 
  copying  the  main  program  to  a  {hard  disc}. 
  Some  badly  designed  operating  systems  require  applications  to 
  provide  an  {uninstaller}  because  of  the  number  of  different 
  files  modified  or  created  during  the  installation  process.