MESA 7i76e PWM Pin needed on Expansion Connector

I currently use all functions of my 7i76ed, and I need to add 1 fast PWM from expansion port.

Therefore I have added an ordinary opto-coupled interface board on EXP1, and I have chosen configuration file 7i76e_7i76x1_7i78x1D that adds to my current configuration:
1 PWM
4 more StepGens
1 more QCount

I made a backup of my 7i76ed board, and I'm now ready to update it with this config.

But I don't catch the difference between "--write" and "--program" commands.

So, prior to light on the fire, could you please tell me which command should I use?

I have no idea what --program does, never used it.
For flashing firmware i always use --write, and i have a lot of Mesa boards, flash them at least once or twice a month, sometimes several times in a day.

Great!
Thank you tommylight, you make me much more confident