I meant Mattermost - is the Slack one representative, i.e. it's the same client software behind a thin shim layer? Does it work as well as Hangout in terms of v

I meant Mattermost - is the Slack one representative, i.e. it's the same client software behind a thin shim layer? Does it work as well as Hangout in terms of voice / image quality and stability? Can people click the screen and the presenter sees where they clicked?