I'd put a keylogger on his home computer for starters.

I have not heard of a keylogger that can be installed remotely. If there is one, he'd have to initiate the installation which would be unlikely to happen.

Reading through your other thread, there's only so much you can do to "prevent" him from doing these things. At some point, you'll have to draw the line in the sand and tell him it's either the women on the computer or you.

Know what I mean?

And ditto for remotely installing spyware on a cell phone. I'd be tempted to install the keylogger on his work computer anyways. If he finds it, what's he going to do? Tell his employer that his wife installed spyware to catch him watching porn on company time?

Me (BH)
Married 2000, DS 8, DD 6, DD 2