run 2 functions at the same time

Hey, I'm new at MatLab but I made functions called ShowMeasure1,ShowMeasure2,ShowMeasure3 that sync 3 instrument devices with RS232. I need to run all the 3 functions in the same time (parallel). Can someone show me how to do it? I prefer an example to be sure. I read about the parallel tool but I couldn't understand which function will be helpful for me and when I tried functions like "parfor" loop it was slower than "for" loop.

Thank you.