Many Palm OS programs "ships" in a zip file. You unzip the zip archive, and click on the PRC file to send it to the Palm via HotSync. Simple, right? I wish more authors / publishers will make sure that their zip archive are setup so that it unzips into its own directory. The Mundu Instant Messenger application does that. It unzips by default to a "MunduInteroperableMessengerV3.0.6" directory. Makes organizing all the application install files easier on the PC.