USB serial laptop to Arduino

hello guys,

no, i need that way. i want to use windows speech recognition macro (with VBScript) to switch an LED on or off.
I know the serial monitor or putty, but i have to use VBScript.

Pls, if you know how, tell me the way to send only one charakter in a simple way to the serial port without using serial monitor or putty.

thx a lot