Why the SCN do not change?

I have three databases running for the test of stream replication. Today I alter the data of the N0.1 database. Applied_scn is the identify of data exchange between oracle databases. But I find that it's applied_scn keep the same as before I alter the data . At the same time, I find the data altered in NO.1 database has tranfer to remote database and applies. This happen but why applied_scn keep the same ? Has a delay ?
who can tell me ?
And I have another question. If I have no operation on a database running oracle 10.2.0.1,the applied_Scn and captured_scn keep increasing and the same value.
Anyone has answer?

APPLIED_SCN NUMBER is Newest SCN at which all changes have been applied. The values in the APPLIED_SCN and NEWEST_SCN columns will match if all available redo log data has been processed.

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