Customized components are not installed and third party or activeX dll are not registred.
The only default components are installed on NT4 servers as far as OptionPack is concerned, or cdonts and browscap.
Windows 2000 does not support additional installations and Windows 2003 Server is installed as recommended by Microsoft for ISP, or smallest installation.
Libraries and default objects of the basic installation are available for the scripting languages installed such as php and perl.
In the dedicated servers offer you can install whatever components you need.