How to wake up an asynchroneous process ?

Context : Windows Server 2003, IIS 6, VB 2008

My asp.net application A stores data in an SQL 2000 database. My application
B (on the same server but under a different userid - not ASPNET) reads these
data, does its job (big load, low priority) and updates the database. A does
not wait any answer nor acknowledgement from B.

Questions :
1) I think B can be a console application, am I right ?
2) How can A wake up B when A has stored data for B in the database ?
3) How can B wait when it has completed a task, until A wakes it up ?

Thank you,
Gilbert
.

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