extended properties are stored in a database; so to make any sense i guess you'd store instance information in master, right? that's where i'd add them;
this worked on my master database in SQL2008:
EXEC sys.sp_addextendedproperty
@name = N'Version',
@value = N'9.0.154.90'
EXEC sys.sp_addextendedproperty
@name = N'InstanceName',
@value = N'LOWELL\SQL2008'
SELECT *
FROM fn_listextendedproperty (NULL, NULL, NULL, NULL, NULL, NULL, NULL);
Lowell
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