I have been using Palm Desktop for years just as my calendar only on my PCs. I at times update the file on a second PC since Palm can goof up once and awhile. How can I prevent double and even triple identical event enties or if not possible, how can I totally delete data and reload from backup.
You can't really prevent multiple entries, Palm software is pretty bad with that. If you wipe your device and re-sync it with the software, it will have only one set of data. If you have existing data on the device, you will end up with duplicates.
There are 3rd party programs that help with duplicates in Palm, have never used them but look around and you'll find it.
If you want to wipe your handheld, look online for the procedure for your model.