The gadgets.* API has replaced the legacy API for all gadget development, regardless
of whether you are developing regular gadgets or OpenSocial gadgets.
gadgets.* API
gadgets.* API Developers Guide
Use this API for all new gadget development.
Legacy Gadgets API (Deprecated)
Legacy Gadgets API Developers Guide
This is the original gadgets API based on the _IG_... namespace.
Do not use this API for new gadget development. Use gadgets.* instead.