SQL server 2000, 2005 , 2008 services

Hi All, If there is one default instance and three named instance of SQL server 2005 or  2008  enterprise editions.

 If i need to make use of Integration,Analysis,Reporting and notification services for all instances , do i need to install for each and every instance independently or commonly can it be used ?

 For example  one default and three named instance , hence 4 times it needs to installed , Valid document or KB article will be useful.

 Wat about SQL server 2000 ( ignore services that does not exist in 2000) .
 
 Thanks in advance