It works together with most e-mail applications and newsreaders. If you download a copy of Envelope with 'PGP inside', Envelope will automatically install PGP and do all the things that are necessary to use it. But of course it can work with an existing copy of PGP too. How to register Envelope Download Envelope and add yourself to the update-list. Please write your e-mail address here if you use Envelope, then I can write you about new versions.
All distributions have the same Envelope-program inside.
People from the USA can better use MIT's PGP262. The international version PGP263i is illegal in the USA because of RSA licences. Envelope needs vbrun300.dll to work. And you will get Envelope uuencoded. It makes a little controlbar with 4 keys on your screen.