ZReaderLite.prc: ZReaderLite can read PalmOS format documents (doc) and TXT files and opens automatically when these type files are launched by ZLauncher. 

ZLQuickLaunchHack.prc: The hack for PalmOS 3.5 or 4.X. Activate this hack in the hack manager program such as XMaster, Teal Master. So that to use QuickLaunch Anywhere feature.
NOTE: PalmOS 5 or higher version can NOT use this hack! 

JpegLib.prc: JpegLib is used for converting JPG file into background image on ALL handheld models. If Sony JpegUtil Library is available on your handheld, you don't need to install JpegLib.