Make an application window active with Child Forms

[jdbee]

Writing an app that uses Sendkeys to Transfer data to a third party program. Basically it mimics a Users Data Entry. Used to work before, but after subsequent Win98 updates from Microsoft, doesn't work anymore. Microsoft kb supplies Findwindow API and BringWindowToTop to make an application active but the code does not seem to work. The window and it's Child Windows is visible behind mine and becomes active when the mouse clicks on it. I can't seem to send keystrokes to it. My app must also remain topmost to the right of this app. Can anyone help. Getting desparate to get the program running again.