Difference between Invoke Application and SystemUtil.Run

Invoke Application "Path"
SystemUtil.Run "Path"
SystemUtil will open the application in default browser.
Invoke Application will open the application in given browser.
Eg:InvokeAPPlication "C:\Program Files\Internet Explorer\iexplore www.gmail.com"
SystemUtil.Run "www.gmail.com"

Declaring variables using VB Script

Dim: Declaration in memory
Dim a
a=10
MsgBox a
Output:10