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@tchambers failure modes:
- you don’t have a protocol handler registered
- you have javascript disabled or unimplemented
- you have multiple accounts or multiple servers

you have two separate components to deal with:
1) authentication: the current website knows who you are, in some limited fashion
2) authorization: the current website triggers an action on your home website

at no point does a custom protocol scheme help with either of these. the problem is more like login or session management