[Qgis-user] Determining the Name of the Current Style File of a QGIS layer

[Bill Casey]

After I have applied style elements such as colour, label font and 
placement to a QGIS layer, I can of course save the style to a .qml 
file.  I ofter have different .qml files with different style elements 
for displaying the same layer data in different projects.  Subsequently 
I might wish to know the name of the .qml file which I had applied to 
that layer. in that project

I know I can copy and paste the style, but I want to know the actual 
name of the .qml file which currently defines the style.

Where should I look?