->Difference between Invoke application and SystemUtil.Run

Invoke Application:
This method is used to launch an application by proving the .exe file path from the QTP script itself.
Eg: Invoke application “Application_path”
SystemUtil.Run:
Eg: SystemUtil.Run “Application_path”

Difference between Invoke application and SystemUtil.Run.

Invoke application is used to invoke any .exe file, where as SystemUtil.Run works with any system utilities like “I-explore” apart from .exe file

How can we launch multiple instances of a web application?
Set IE1=CreateObject("InternetExplorer.Application")
IE1.Visible=True
IE1.Navigate "http:\\Yahoomail.com"
Set IE2=CreateObject("InternetExplorer.Application")
IE2.Visible=True
IE2.Navigate "http:\\Rediffmail.com"