TIP #48 [http://purl.org/tcl/tip/48] provides an API to support alternative styles for Tk widgets.

This TIP was implemented in March 2002 (which means that the functionality is in Tk 8.4.?), but there is very little other than the TIP itself to document
how this might be used and what further work is required.  ''([DKF] - Further work required includes documentation, application to existing widgets, and plenty of tests...)''

The changing faces of Technology:

A category of hardware and software that enables people to use the Internet as the transmission medium for telephone calls. For users who have free, or fixed-price Internet access, Internet telephony software essentially provides free telephone calls anywhere in the world. To date, however, Internet telephony does not offer the same quality of telephone service as direct telephone connections. 
There are many Internet telephony applications available. Some, like CoolTalk and NetMeeting, come bundled with popular Web browsers. Others are stand-alone products. Internet telephony products are sometimes called IP telephony, Voice over the Internet (VOI) or Voice over IP (VOIP) products. 

[[http://www.voip-guide.org/internet-telephony.php | Internet Telephony]] 
[[http://www.voip-guide.org/ |VoIP]]
[[http://www.predictive-dialers.org/voip.php |VOIP]]
[[http://www.software-engine.org/bpo-software.php |BPO]]
[[http://www.predictive-dialers.org/crm.php |CRM]]

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[category gui]