Doesn't Slack have a similar system to IRC, where you can specifically send a notification to someone by prefixing with their handle? I've worked remotely for

Doesn't Slack have a similar system to IRC, where you can specifically send a notification to someone by prefixing with their handle? I've worked remotely for many years and this was never a problem. Need some company? Just read and follow a few channels. Want to get work done? Ignore client and code. If someone needs me, a notification + sound will pop up. Works fine with IRC, really.