VS2010 Running 2-3 Applications At The Same Time?

I have created a main application form that has buttons that start up various other applications.

Following advice on here from a previous post, I have imported all the files of each separate application into the main application.

There will be times when the user wants to run more than one of these applications at the same time. I know you can just import the '.EXE' file of each app, and you can then run several at a time. But because I have all the files without the .EXE, you can only run one at a time, you have to close one app to start another.

My question is simply; Do I have to import the .EXE file of each app, or is there some code I could put in my main form that will allow me to run more than one app at a time? (the reason for having all the files of each app is so you can make any alterations without having to open each app separately).

The code below is a typical code for one of the applications start buttons, all the buttons codes are the same, apart from the app name, the buttons are imported, so not standard buttons.

Private Sub btnCoordsCalc_ClickButtonArea(ByVal Sender As System.Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles btnCoordsCalc.ClickButtonArea
Dim frm As New frmHoleCoordinateCalculator

[Code]......