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"By 2015 more end users will access the Internet through a mobile device than a PC, according to a new report from the International Data Corporation (IDC)."

While focused more on desktop support situations, TeamViewer allows presenters to share PC or Mac desktops with participants on PCs or Macs. Both presenters and viewers must download and install an application-making it more appropriate for internal teams than more public situations. A free version of the tool is available for private use; otherwise it starts at about $250 for six months.

Screenstream(www.nchsoftware.com/screen/). Free for anyone to use, Screenstream allows Windows PC presenters to share their desktop with participants on PCs, Macs or Linux, who view the desktop through a browser with no install required.

Yugma provides desktop sharing, chat and white-boarding. It also supports VOIP conferencing, including a feature that integrates seminars with Skype calls. Presenters can use PC, Macs or Linux. Participants can use almost any system or browser by downloading a Java applet. A free, limited-functionality version allows up to 10 people to participate; more feature-rich versions start at about $200 per year for up to 20 people

DimDim is a fairly new, streamlined online seminar application with support for chat, slide sharing, emoticons, white-boarding, VOIP voice conferencing and video conferencing. Only PC desktops can be shared, but DimDim supports Mac and Linux users for other features. Participants can enter meeting rooms using almost any system or browser, typically without a download. A free, ad-supported version allows up to 20 people to participate; a version without ads starts at $99 per year for up to 20 people.