Most of the following programs can be used on various type of hardware and can communicate with other type of hardware.
In this, more recent, example my daughter is chatting from South Africa, using an Apple computer.
You can see us in the small picture below Skype keeps changing and improving.
If you get feedback (whistling) while on Skype, try using earphones or even a telephone at the same time.
Note that if you want to see the people on the other end full screen just move the cursor towards the bottom and click the full screen item. To shrink the picture again, move the cursor to the top and click the appropriate text.
This is not required for the Skype type program, where one can either use a headset or even a USB telephone.
Another relevant service is at brilliant service can be found at Here is a later incarnation Several people can be invited to a call, though I find it confusing. Skype even has a facility for phoning ordinary telephones (at a cost).But there are details found in Skype help at https:// In this respect I think Google's Hangouts add-on is better or send instant messages to your relatives in far away places for NOTHING, you should try this. Obviously for PC to PC calls you both need a microphone and speakers or a headset, and you need to have at least Windows 2000 or XP.The one exception is Apple's Facetime, for which you need an i Pad, i Phone or other Apple product with a forward facing camera.The programs are Skype, Viber, Tango, Zoom and Hangouts.Only the host has to have a PC."You can also take snapshots with Skype. If your camera is working OK you should see a picture of yourself and can take a snapshot.