Hello.
How can I Monitor a Windows Desktop in Lan like an Spy? I don't like the user inform of it.
Some Windows application exist for it like "Atelier Remote Commander" but I can't find Linux version.

Tnx.

Don't. Asking that is unethical and against the LQ Rules (which I'm sure you haven't read as you signed up so do so now: https://www.linuxquestions.org/linux/rules.html to save yourself more trouble later on).

Oh, Monitoring users is illegal ? if yes but how about "Atelier Remote Commander" ?

I used to use vnc to keep an eye on my stepsons computer use. Like any technology, you can use this kind of thing for good or ill.
http://www.techrepublic.com/blog/dat...sing-tightvnc/

0) this is the Linux Networking forum: all questions about Microsoft Windows should be in the /General forum.
1) if you have a question about a commercially licensed Windows application then ask the vendor.
2) your local Law decides if monitoring users is illegal. Since we haven't been given any relevant information we are extremely cautious and try to avoid aiding illegal practices.
3) the fact that you do not want to inform the user is highly suspect. If this is a work environment you are not likely the person to decide if you may do so.