logical standby using different os

The basic questions is: Does a dataguard logical standby have to be on the same OS as the primary?

Off hand I was thinking, yes is probably does. The standby has to be able to read archive logs generated on the primary. Is the format of those logs dependent upon the OS involved? I thought it was, therefore, I thought the OS had to be the same (as well as the version of the DB).

However, I had somebody tell me that they were sure that one reason oracle created logical standbys was so that you could do this across different OSes.

A somewhat preliminary search of the Dataguard concepts manual and Metalink has not provided a definative answer either way.

Thanks
Matt

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