PALM Zire 21 Wireless: IrDA <--- what this?

[ATI RADEON 8500]

Was looking at palm zire 21 and was wondering what is that wireless feature used for? And what does that do.

Also can anyone give me a advice if this any good on personal experience?

http://www.newegg.com/app/viewproduc...fer=pr1c3watch

[Direct1]

Well, this may help? Good luck!

IrDA’s New Full Range of Digital Information Exchange via Cordless Infrared Connections

Regarding present publications on IrDA features, IrDA Data is recommended for high speed short range, line of sight, point-to-point cordless data transfer - suitable for HPCs, digital cameras, handheld data collection devices, etc. If IrDA is supported, it must be targeted at the 4 Kbps per second components. IrDA Control is recommended in-room cordless peripherals to hostPC for lower speed, full cross range, point-to-point or to-multipoint cordless controller - suitable for keyboards (1way), joysticks (2 way & low latency) etc. IrDA Data and IrDA Control requires designer attention to ensure spatial or time sharing techniques (Appendix E) so as to avoid interference.