Windows host unknown when pinging, but is resolved by nslookup. Why?

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http://askubuntu.com – On my linux host I try to reach the windows host in the LAN (wifi). If I try to ping that windows host by its name, I get unknown host. If I query in nslookup, then I get valid IP. VNC also refuzes the host name. How to make windows host visible by its name? Windows host has dynamic IP. (HowTos)