How can I see what other program the other PC in the LAN network without going to the computer? like my friends dad want to see what his son have on his PC but he have password, so how to know what kind of program he have?
Using the main administrator account you should be able to see what all is installed for any given user. If the master account is passworded, then you're out of luck. As you're basically asking for hacking advice.
I didnt notice the LAN part. I was simply talking about the window user accounts. That's my fault.
If they want to see if its their sons computer causing the issue. Simply remove his computer from the network and retest the connection speed. If it goes up, its something on his computer. If it stays the same, than it should for the most part, rule him out.
well, utorrent isn't bad, but how some people use it are. many linux distro's use bittorrent to distribute their os (legit), but there are groups, such as TPB and others that use it for _illegal_ purposes (music, movies, apps, games, etc).
Simply having bittorrent (utorrent) installed isn't a bad thing, neither is running it, just his purposes
If he's got an internet usage concern, check the Router port tables. It'll list all the internet services linked to his sons machine and he should be able to close them. Add a password to the router and you're done.
Of course, he could just talk to his son about it but this is a tech forum, not family support