How to execute addon command in .lua

[usiname]

I'm trying to make very basic addon to command other addon. I found how to do this via the command SlashCmdList and example for this with recount SlashCmdList["ACECONSOLE_RECOUNT"]("show"), but how to find the specific library used by other addon? Recoutn using ACECONSOLE_RECOUNT, but in other addons i can't find anything like this.
I am trying to find this out for MoreStopwatches https://www.curseforge.com/wow/addons/more-stopwatches