Local administrator on a domain controller

Hello
I have a Windows 2003 Standard server running as domain controller. I need to enable or logon with the local admninistrator. I've read some ambiguous posts on the Internet so I'm not sure if it's posible at all.

You might ask why I don't use the domain administrator. The answer is that I need to get in touch with an Adaptec raid controler. And I can not do that with the domain administrator. Se here for more info:

http://adaptec-tic.adaptec.com/cgi-bin/adaptec_tic.cfg/php/enduser/popup_adp.php?p_sid=Nemne_Ai&p_lva=&p_li=&p_faqid=10090&p_created=1066113935&p_sp=cF9zcmNoPTEmcF9zb3J0X2J5PSZwX2dyaWRzb3J0PSZwX3Jvd19jbnQ9MTUmcF9wcm9kcz0wJnBfY2F0cz0wJnBfcHY9JnBfY3Y9JnBfc2VhcmNoX3R5cGU9YW5zd2Vycy5zZWFyY2hfbmwmcF9wYWdlPTEmcF9zZWFyY2hfdGV4dD11c2VybmFtZQ

Any helt would be appreciated.

/Lars Skjoldby