Trouble using LogonUser

I am running into a couple of problems using LogonUser().

My first problem is that I can't seem to authenticate a user against a
domain in which the computer is not a member.  Is this possible?

Second, I am having problems with nested impersonations.  When I nest
impersonations they succeed (the current user is the nested impersonated
user) but a File.Create() operation complains that I do not have the proper
impersonation level.  Impersonating the nested user directly works fine.  In
both cases my impersonation level reports as None, but I can't figure out
how to change this.

Thanks,
-Mont

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