Emergency Glucagon injection and why/how it works and when it doesn't work. Something we all need to know.

I am in the CGM in the Cloud group on Facebook: https://www.facebook.com/groups/cgminthecloud/

There was recently a large discussion about the Glucagon injection and how and why it works and when it doesn't work.  When I was diagnosed with Type 1 Diabetes no one, not a single health care professional told me how it works and why.  More importantly they didnt tell me that it won't work in all instances of a seizure inducing low.  This is very important and as I am finding out, I was not the only one who didn't know this.