Juan,
It's possible to use Multisim as an Automation API. You will need the Multisim 10.1 to use the new API features available.
Open the Multisim 10.1 and go to Help >> Multisim Help. Select the Contents Tab and look for the Automaton API Chapter. In there you will find all the information needed.
Dario Camargo
NI Brazil
#1159649