You can have your ajax methods call a soap web service, page method, mvc controller action, wcf service method, and probably other apis too..
It's a freely available library that allows Java Script to 'communicate' with C#, and vice versa, by keeping a connection active between the client and the server.
Then, the recipient can use a web browser to open the envelope. Most Registered Envelopes are password-protected with the exception of low security envelopes, which are encrypted but do not require a password.
When you register, you create the password that you use to open the Registered Envelopes that you receive.
Lewis PS - As this bug seems to be cross-platform, perhaps we (read: someone with authority - probably you, David) should change it from "Windows XP" to "All." Scratch that. I closed SM, removed both the old and the restored version of the file (thus disabling my filters), and even turned off Junk Mail controls. I also tried removing my filter log file, which had grown in excess of 30MB.
If you choose to participate, the online survey will be presented to you when you leave the Technet Web site.
The second one is to use the new REST POST endpoint The error message indicates that your App doesn't have permissions to do the add.
You need to request write permission at the Web scope in the App manifest.
A Registered Envelope is a type of encrypted email message.
To ensure privacy, you should never send sensitive information through standard email, where it is susceptible to unauthorized access.