Many phones are PDAs, or you can find older models on eBay.
pda
Depending on if you have one or not, this place is a good spot to go to. http://www.geeks.com/products.asp?cat=PDA
what is a pda in an aircraft
If you asked what a file on a PDA is, my answer is everything. anything you see on a desktop computer can also be a file on a PDA. If you asked what a .pda file (having an extension of PDA), sorry, no idea. :)
You will need to contact your cellphone carrier to find out about plans for it.
You don't need to contact Hotmail. Though you may need some information from them you probably need to contact your pda service provider to find out how to set up email on your pda from hotmail smtp servers.
You can find medical software for PDA's a http://themedicalguide.hypermart.net/. Another great site is http://www.studentdoc.com/medical-software.html.
PDA's can be connected to a computer. Files can be transferred from the PDA to the computer and from the computer to the PDA. Data such as phone numbers, addresses and appointments can be synchronized between PDA's and computers so the information can be the updated.
A palmtop is a pda which is a personal digital assistant and a pda is a palmtop
the disadvantages of the PDA are that they are very large.
FUTURE TRENDS OF PDA
Depends on the PDA.