sspi cache vs mit credential cache

[Subu Ayyagari]

* I have windows AD 2003 forest with 2-way trust to
  MIT realm.

* Crossrealm setup has been configured.

Question: From info available on the mit website,
          it appears the microsoft cache *has* to be 
          copied to mit credential cache (leash
import).

Is this required? Can applications (eg: kerberized
ssh)
directly use microsoft credential cache?

thanks
-subu

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