In Win Script Host, Shell object supports Run method. Would that suit your need?
Ref : WSH documentation
Run Method [excerpt]
Description
Creates a new process that executes strCommand.
Syntax
object.Run (strCommand, [intWindowStyle], [bWaitOnReturn])
Parameters
Part : Description
object : WshShell object.
strCommand : Environment variables within the strCommand parameter are automatically expanded.
intWindowStyle : Optional. Sets the window style of the program being run.
bWaitOnReturn : Optional. If bWaitOnReturn is not specified or FALSE, immediately returns to script execution rather than waiting for the process to end.
If bWaitOnReturn is set to TRUE, the Run method returns any error code returned by the application.
If bWaitOnReturn is not specified or is FALSE, the Run method returns an error code of 0 (zero).
The following example executes notepad application and waits until closed:
Set WshShell = WScript.CreateObject("WScript.Shell"

WshShell.Run "notepad " & WScript.ScriptFullName, 1, TRUE