There are many French users of VC. Nime5ter and I both speak French, and although I am not really comfortable writing in French, I can usually read it without a translation tool. You can always write in both languages if you prefer.
VoxWav free does not have a WOL (wake on LAN) feature, so you must use VoxWav Pro.
Not all computers can be woken this way but most can if they are properly configured.
On many newer computers WOL will work without requiring any configuration, but if it doesn't work read xtermin8r's post at the beginning of this thread.
If you have a second computer there are some good free programs you can use to send WOL messages when testing, in case you don't want to buy VoxWav pro right away.
In VoxWav Pro when you click the radio tower icon, it sends a "hello" message out to all computers on the LAN. Any computers running VoxCommando will reply with information about their name, IP, and Mac address. VoxWav stores this information. The Mac address is used to send a WOL message every time you select that computer from the list.