What commands do you need to execute before upgrading to windows 2000 to

Before upgrading to windows 2000 to windows 2003 insert the CD of windows 2003
then open 1386 folder, then at command prompt type the following commands.
Adprep /forestprep
Adprep /domainprep
(i. e., f:\1386(2003)>adprep /forestprep and f:\1386(2003)>adprep /domainprep)
If you are upgrading entire forest type the adprep /forestprep at root domain.
If you are upgrading only a domain then type the adprep /domainprep at
root domain.
Note: You have to type the above commands on the server which has IM role.