COM+ Question:

The objective of JIT activation is to minimize the amount
of time for which an object lives and consumes resources on
the server.

With JIT activation, the client can hold a reference to an
object on the server for a long time, but the server
creates the object only when the client calls a method on
the object.

After the method call is completed, the object is freed and
its memory is reclaimed. JIT activation enables
applications to scale up as the number of users increases.