Compaq AERO - CAsio PDAs - can I put Internet Explorer

[KIDO1]

Hello. I am going to buy a PDA - Compaq Aero 2100 or Casio Cassiopea e100. My questions is:
Can i put and do they have an Internet Explorer built in? I have a Nokia 8290 phone with IRDA and 9.6 modem and I would like to connect to the internet using the PDA. Has someone done it?

Thank you!