Vbs Protocol - open notepade with muliple vuser - failed

Hi All

I wrote a code in VBS  Protocol :

 for example:

Set wshShell2 = WScript.CreateObject("WSCript.shell")

wshshell2.run "notepad.exe"

WScript.sleep 2000

wshshell2.sendKeys("a1")

WScript.sleep 1000

wshshell2.sendKeys("a2")

WScript.sleep 500

wshshell2.sendKeys("a3")

I run it with multiple 3 users simultaneously but it not running  independently .There were 3 opened notepad  but all the data were in one nopade.

How can I make it to running  independently ? Session Id?

Thanks

Refael