this is from the apple site:
About Startup Disk version 9.2
The Utilities folder on the Mac OS X CD contains Startup Disk version 9.2, the control panel you use to select the startup disk for your computer. You need to use this version of Startup Disk to select a Mac OS X disk as your startup disk.
Important If you start Classic after installing Mac OS X, Classic installs this version of Startup Disk in the Mac OS 9.1 System Folder it uses.
To install the control panel when you are using Mac OS 9, drag it to the System Folder on your Mac OS 9 disk. If you are using Mac OS X, drag it to the Control Panels folder in your Mac OS 9 System Folder.
To use the control panel to select a Mac OS X startup disk:
1. Open the Startup Disk control panel and select the Mac OS X volume.
2. Click Restart to restart your computer.
For more information about starting up your computer, see Mac Help or the book, Welcome to Mac OS X.