How to login as Administrator on HP Thin Client XP embedded

On Hp (Hewlett Packard) Thin client with Windows XP embedded, when it is turned On, it loading  to windows as a user. with limited facilities, no right click, no control panel, etc.
If you want to go as an administrator, follow these steps :

• Press and hold Shift key

• Click start and click log off (shift key is still pressed until user login form appears )
• Type Administrator in login name
• The default password is Administrator