Is it possible to do this? Send messages to other scripts

I mean doing something like a script in a button does this when clicked:

Bsajsjdf = 1

And then a script in a workspace does

If bsajsjdf = 1 then BlahBlahBlah.Play

And then setting the number to different ones like if clicked once turns bsajsjdf into 1 and if clicked twice it turns bsajsjdf into 2 and etcetera etcetera etcetera

Is it possible or messages are only available for local use?

I need help this can be very useful to a game in which you will have to choose an icon