How to launch a new program without pulling up the taskbar?

I have an application ,running full screen, top most, and i want it so that when a user clicks a button it launches another exe file (also topmost) i can make it launch the EXE file with a new proc开发者_如何转开发ess, but the taskbar pops up whenever i do. How do i prevent the taskbar from comming up?

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How about a different approach?

This page has some registry key values to change task Bar settings. Why not disable "Always on Top" through your code. I must admit hiding/disabling the taskbar is very annoying from an user perspective.