Question : what is GFC?

Hey there,
I'm not clear on what is GFC and the 16 possible values. Could anyone help me out here or does anyone know of any www that provides a complete explanation of it.
thanks

Answer : what is GFC?

Generic Flow Control.  It is a field in the ATM header.  it is 4 bits long nad there fore has 16 possible values.  It isn't used very often and has local significance.  It provides support for flow control and multiplexing.