My own account login items list in my systems preferences window is limited to one item- an istat menus helper app. But my mac hd/library/StartupItems folder contains two items that I don't recognize and don't think have much to do with starting up the computer. One is a Qmaster folder and another is named RDUSB00A3Startup. Each folder contains a few items, including a unix executable file and a plist file. My mac hd/system/library/StartupItems folder is empty. Can anyone please advise on whether the items in my mac hd/library/StartupItems folder are necessary and if deleting them could affect my computer? I don't use Qmaster and have no idea what the RDUSB00A3Startup folder is for. The Mac is a Mac Pro. Thanks for any advice.