how installer create a copy of msi with new file name in temp ********?

[C++ Programming]

hi all,
can anybody help me on While installation of msi Windows installer creates temporary msi with new and unique msi file name In BootDrive:\WINDOWS\Installer. i want to know how windows installer creates unique msi name for every installation. http://www.barakasoft.com/script/Forums/Images/smiley_smile.gif