[p4] using p4merge outside p4v

[adam question]

I am using an account where there is no xdiff. I have realized when I
run p4v I am able to use p4merge, and it does almost the same thing. I
tried running p4merge from command prompt, that did not work. Is there
a way to access p4merge somehow, do I need to add a path, etc

Thanks
Adam