How to use a batch file to open applications
First you need to know the name of the file you want to open, for example, firefox.exe.
Open notepad and insert either of the codes below.
start firefox.exe
That code will open firefox to the home page. To make it go to another page, for example google.com, add an argument after it.
start firefox.exe http://google.com
Save that file as anything you want, but it MUST end in .bat, not .txt.