bluetooth
I use a Palm TX with bluetooth and a GPS buetooth device, good up to 10' away, but to run a device such as a plotter or large inkjet you do not transfer information as you say in a large amount quickly such as a cable does and then let the plotter take over. Bluetooth is design for streaming information at contuinous time on small devices such as phones, PDA's, keyboards, mice etc. They do make bluetooth USB port plugins and I wish you luck in trying to get a plotter to run efficiently. If you want to go wireless look into WIFI by plugging your plotter or printer into a wireless router and your WIFI computer which is fairly simple.