Hi there, I know that we can use os.system() to lauch applications. Say, I want to use notepad to open a file - data.txt I should do os.system('notepad data.txt') BUT what if the string 'data.txt' is stored in a variable, how can use notepad to open it? file='c:\data\data.txt' os.system('notepad and What? Or, is there anyway to lauch application rather than os.system() Thanks a million. Hy