Hard buttons for spindle start stop in Gmoccapy

I would like to carry out spindle start  and stop from my machine panel.  I can see Hal pins for spindle speed increase  /decrease  but none for start / stop
Is there any facility for this? Am I just missing them??

Will look a bit closer tomorrow, but sounds like it should give me what I want .
I need to get familiar with linux jargon though to take me forward.

Probably gives me what I want , if only I could break through the mystery of linux .
So I want to start my spindle the appropriate Halui command seems to be :-
halui.spindle.N.start (bit in)

No doubt this is simple to experienced Linux users , but from my viewpoint I need to ask .. What is the significance of "Bit in " What does it mean ?

Then the N in the command . Is this a word with a specific meaning or is it a variable

Then "a rising edge on this pin starts the spindle".
I understand that my button is connected to a pin which is standing at 5v and pressing the button will drop this to ground voltage so a falling edge ??????
How do I cater for this ?

So I have called up halui in my ini file HAL section.
[HAL]
HALFILE = TCL_lathe__Base.hal
HALFILE = custom.hal
POSTGUI_HALFILE = postgui_call_list.hal
HALUI = halui

I have 9 working buttons .
Five Jog buttons which drive the following jog functions and their commands reside in the Hal file :-
net jog-x-plus <= parport.1.pin-10-in-not => gmoccapy.jog.axis.jog-x-plus

net jog-x-minus <= parport.1.pin-09-in-not => gmoccapy.jog.axis.jog-x-minus

net jog-z-plus <= parport.1.pin-08-in-not => gmoccapy.jog.axis.jog-z-plus

net jog-z-minus <= parport.1.pin-07-in-not => gmoccapy.jog.axis.jog-z-minus

net turtle gmoccapy.jog.turtle-jog <= parport.1.pin-06-in

Then four program buttons which start and control program steps and these reside in the Custom postgui hal file ,

net startbutton parport.1.pin-05-in => halui.mode.auto halui.program.run
net stepbutton parport.1.pin-04-in => halui.program.step

net pausebutton parport.1.pin-02-in => halui.program.pause
net resumebutton parport.1.pin-03-in => halui.program.resume

So Now I wish to start my spindle using pin 06 on parport 1
I am guessing that I need something like this ? ( I say like this cos this just throws up an error to tell me that the expression is not valid)
net spindlestart parport.1.pin-06-in => halui.spindle.N.start

so what is wrong with my choice here ?
More important , Where do I find formats which are acceptable . I am floundering here

Cant help saying I am very disappointed that this thread just dried up.
I expected more !