Dear Sir/Madam, I am trying kernel programming on Mac OS X. I have read the following 3 papers: Kernel Extension Dependencies Creating a DeviceDriver With Project Builder Packaging Your KEXT for Distribution and Installation And I have write two kernel programs. One is accroding to Kernel Extension Dependencies and I name the project as kerneltest001. The other is accroding to Creating a DeviceDriver With Project Builder and I name the project HelloIOKit. After I have finished packaging and installing the projects,I can find them on window of "system.profile->Extensions". On the top of this window there are four column. On the first column there many .kext files such as ACard62xxM.kext,ACard671xSCSI.kext .My project kerneltest001.kext and HelloIOKit.kext are also there. But on the fourth column says that my kerneltest001.kext and HelloIOKit.kext are "You can not use", why? yours sincerely user of Mac _______________________________________________ darwin-kernel mailing list | darwin-kernel@lists.apple.com Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/darwin-kernel Do not post admin requests to the list. They will be ignored.