three computers and one secret key?

[Robert T Wyatt]

Hi folks,

I'm new to the list. I live and work in Austin, TX.

I've been trying to find this answer and have tried various things but
I'm not having any luck. The only thing I'm sure of is that this can't
be an original question, so I apologize for that and for not having
found the answer already.

I set up macgpg and enigmail on my home computer (running Mac OS 10.4.7)
and it is working great (with SeaMonkey and Thunderbird). Now I would
like to use the same secret key on both of my work computers, one is Mac
OS 10.3.9 and the other is Windows XP. Both of these computers also have
SeaMonkey and Thunderbird installed.

Ooh, I think I just got the Mac to work by (securely) moving my at-home
.gnupg folder into place on the work computer and reinstalling the
enigmail extension. Oh darn, it almost works but it gives an error when
sending mail: Error - bad passphrase.

So what am I supposed to be doing? Assuming it can be done, how do I
export my secret key for use on other computers? Do I have to use a
memory stick or other portable device to make this work? Is it possible
(and prudent) to put it on a server somewhere in a secure fashion?

Thanks much for any pointers,

Robert