hi friends,

            actually I am doing a task management software for my self. and in that i need to be remembered by the system regarding the task to be done when that time matches as shown below table.
   * when the time is 10:00am on 30-dec-12 it has to show a remainder message regarding the task  irrespective of the work that we are doing in the computer ,similarly the other also...
 please help me in doing this ...

       
taskid taskname task details remainder date time
1 meeting friends 30-Dec-12 10:00am
2 consulting doctor 31-Dec-12 12.30pm