DBMS_ALERT supports asynchronous notification

Hi,
Im working over dbms_alert package, and I would like to know whats the meaning about:
"*DBMS_ALERT supports asynchronous notification of database events (alerts)*".
Could anybody explain it to me?
Thanks a lot in advanced....

EZGms wrote:
Hi,
Im working over dbms_alert package, and I would like to know whats the meaning about:
"*DBMS_ALERT supports asynchronous notification of database events (alerts)*".
Could anybody explain it to me?
Thanks a lot in advanced....http://download.oracle.com/docs/cd/E11882_01/appdev.112/e16760/d_alert.htm#ARPLS351
"Suppose a graphics tool is displaying a graph of some data from a database table. The graphics tool can, after reading and graphing the data, wait on a database alert (WAITONE) covering the data just read. The tool automatically wakes up when the data is changed by any other user. All that is required is that a trigger be placed on the database table, which performs a signal (SIGNAL) whenever the trigger is fired."
provides "real time" notification

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