Object.Status

Dim WshShell, oExec
Set WshShell = CreateObject("WScript.Shell")
Set oExec = WshShell.Exec("calc")
Do While oExec.Status = 0
     WScript.Sleep 100
Loop
WScript.Echo oExec.Status

var WshShell = new ActiveXObject("WScript.Shell");
var oExec = WshShell.Exec("calc");
while (oExec.Status == 0)
{
     WScript.Sleep(100);
}
WScript.Echo(oExec.Status);