Need an example how to set function mode inside procedure & assign a bindkey to it .
I don't understand the question. What do you mean by "set function mode inside procedure"? What does "assign a bindkey to it" mean? (what is "it" for a start?)
hisetbindkey has following option ("Layout" "t_key EF" "application") .I need a template of procedure used to access this enter function mode.
It's not a matter of "accessing this enter function mode". What it means is that if you are in the middle of an enter function (e.g. enterPoint, enterBox, enterPath, enterPoints etc) then the "EF" bind keys take precedence over the non-EF bind keys. So if you hit a particular key, and there's an EF bind key defined for that, it would call that function. If you're not being prompted to enter a point, box etc, then the normal bind key applies.
If there's no EF bind key, then the non-EF bind key applies all the time.