What does Wireshark promiscuous mode do?

My friend and I are setting up some monitoring devices at our office to see how the network looks before we setup our VPN server (PPTP/L2TP) and connect all the servers. However I am very interested in promiscuous mode. Can anyone explain what does this mode do exactly? The term "promiscuous" is used in a number of contexts. Here it is applied to capturing packets from an interface other than the one whose destination you're actually interested in.

In Wireshark terms, you may be familiar with the display's ability to highlight fields. The promiscuous capture is different because it doesn't show information that it finds but you still must have the relevant interfaces enabled.

How do I turn off monitor mode in Wireshark?

I am using Wireshark to monitor my network traffic and find the following line in my packet dump.

The problem is I am not sure if I have turned monitor mode on or off. I have been using the GUI for wireshark and never have seen this, can someone please help me out here.

1) IP: 239.255.192.1) Src port: 1030 Destination port: 53 - UDP
(2) IP: 239.1) Src port: 1030 Destination port: 53 - UDP (3) IP: 239.1) Src port: 1030 Destination port: 53 - UDP (4) IP: 239.1) Src port: 1030 Destination port: 53 - UDP You are sending the packet to monitor mode. Wireshark will use this information to show a separate window for each different host you're connected to. The host will be labeled as "monitor".

The packets you send in monitor mode will be stored in a separate window so you can see each one in isolation. Disabling monitor mode. If you want to disable monitor mode, go to Tools -> Preferences -> General, uncheck the "Monitor Mode" box. You may want to leave this option enabled so that Wireshark will continue to monitor any traffic you have opened up in monitor mode.