Yes.
you can't you HAVE to download messenger to video chat
Yes, the newer versions of MSN Messenger do support video chat.
Yes.
Yes
Yes. The Windows PC can video chat via several applications such as MS Messenger, Yahoo Messenger, Skype, Gmail chat, and AOL Instant Messenger. The Mac can video chat through several of these. Between Macs the Apple application iChat is used. This uses the AIM network and can also talk to Windows AOL Instant Messenger users. Both Macs and Widows computers can video chat via SKYPE and Gmail. For Mac, there is an application called aMSN which can video chat to Windows MSN.
no you cant
If you both are using the latest version of Yahoo Messenger, speakers and microphones (or headsets), and a camera, there is a "Start Video Call" option on the main chat window (on Version 10 it's on the upper left hand corner). You can also choose it from the main Messenger window by using the drop-down arrow just to the right of the person's name you want "video" chat with.
Skype.com is probably the biggest video chat services as of right now. There are plenty of choices out there, most Instant messenger services has video chat functionality.
Paltok messenger or also known as Paltalk Messenger, is a service that offers a variety of communication with friends. It offers, Video Calls, Texts Chat, Live Chat, IM and is even offered on your mobile device.
It depends on what program you use. If you use windows live messenger for example to communicate, you can chat on video without having to download extra programs.
Apple made "FaceTime" for video calling from MAC to iPad 2, iPhone 4, iPod touch or MAC. All you need is an Apple ID and an e-mail address and that's it! Another way for video chat is "Yahoo Messenger 2.0". With yahoo messenger 2.0 you can make voice+video calls to other messenger users on iPhone 3GS, iPhone 4, MAC or other windows running systems.
instant messenger and gmail can not chat between them yet h