By using a program called Pocket DOS I am able to run various DOS programs on my IPAQ 3835. Right now I am running Elnec a DOS based antenna design program. Kinda nice to have an idea for an antenna and be able to whip out my pocket pc and try it out.

Pocket DOS emulates a PC XT/AT with CGA color graphics. It's not the fastest program in the world but it does the job. Just about any DOS program will run on it. GWbasic and Quick basic both work. HamCalc should work too. Any DOS based logging progam. You can run it in portrait or landscape mode. Will even do RS232. Give it a try!