[OpenAFS] Login on 2 cells

[Sensei]

Hi.

I have a ``weird'' question. I have 2 cells a.b.com and my.a.b.com,
these two cells use kerberos, a.b.com uses heimdal and my.a.b.com mit
k5. The two realms have x-realm trust.

How can I make a workstation login on my.a.b.com and in case it fails,
login on a.b.com? ...Obtaining the correct tokens of course...

I know that a workstation can belong to one and only one cell, so there
must be another way. Note that the users are NOT on both cells, but just
on one of them.
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Sensei    <mailto:senseiwa@tin.it>
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A)bort, R)etry, I)nfluence with large hammer.