May I track application called by c# but handled manually

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C#3.5

When I start an application(say B) by command line in unattended mode from application "A",it can be tracked by c# code in "A" as well as I can track its exited event and can do something when the application "B" exit.

But it can not be done if application "B" is started by "A" but handled manually (imagine an installer handled by next button).I can not track the application "B" exit event.It is fired when the application is started.

Is there any way to do this?

Actually from application "A" I started an installer "B".I want to show a label text in "A" when user has finished installation and click close button on "B".