If you've installed something and then can't see or access it on your Palm, then you might have installed a DATA file for a un-installed Palm application
. A good indication of this is if you go into the Memory App (or Info from Apps picker in OS 3 and higher) and see the "application" but don't see it in your list of apps to run.
In order to see this data, you'll have to install the application that this data is for. Good examples of data file applications (Files that are likely to be available that need the application to view) are: Doc files, JFile databases, etc. Check the file you downloaded (if it's a .zip file) or check the site you downloaded the file(s) from. Somewhere you should be able to find the name of the application you need to install to see that data.