sriram,

>i wanted to know if it is possible to connect an external device such as a 
>camera to a Palm PDA and fetch data from the camera?

External devices such as a camera are (nearly always) a USB client device, so
must attach to a USB host device such as a PC.  Current Palm OS based devices
are also client mode so cannot talk directly to another client such as a camera.

Two options:

 1) Remove card from camera and insert in palm to view pics
 2) Attach both devices to an intermediary device operating as a USB host

There is a supplement of USB being developed called USB On-The-Go which
addresses the desire to have a device work in either host or client mode
depending on what it is connected to at the time.  See
http://www.usb.org/developers/onthego/ for details.

Here is one sample of how you can do it:

http://www.usbgear.com/USB-OTG.html

Doug

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