Example:

mailto:support@innovative-bytes.com?subject=Support%20Question

Create an e-mail in the default mail client with a recipient and subject line.

Example:

mailto:someone@mail.com?subject=Download%20the%20Start%
20app&cc=someone_else@mail.com&body=I%20recommend%20the
%20Start%20app

Create an e-mail in the default mail client with both to & cc recipients, a subject line and a message body.