[alextingle]

Example: If a build is going on in the background, I can see when it stops.

[skydhash]

You can use `build-tool; tput bel` to hear the bell when it ends. Some terminal allows to set the urgent flag on the windows when the bell rings.

[forty]

Yeah I have used desktop notifications for such things (via notify-send etc), but I'm going to accept this explanation for transparent background as it makes some sense to me.