It uses only the flash and main memory.  However, you have to replace
Wince (or linux) to use it.  That makes it more of a commitment than
on a PC.  We're not putting it out there till we find out why its having
problems with the last batch of ipaq's we got.  We use the linux flash
bootldr.  Before you even think about it, look at the 'installing linux'
for it under www.handhelds.org.