Installation of my connected product

• How many HOMETOUCH can I have in one apartament/single house?
• Is HOMETOUCH compatible with other BTicino 2 wires products?
• Is HOMETOUCH compatible with other brands products?
• Is my HOMETOUCH compatible with my existing Door Entry System?
• Can I replace a pre-existing BTicino 2 wires internal unit?
• can I use HOMETOUCH only for touch screen in MyHome_Up system?
• Can I install Home automation and in a second step Video Door Entry?
• can I use HOMETOUCH only for internal unit?
• How can I connect HOMETOUCH?
• Can I install Video Door Entry and in a second step Home automation?
• How can I install HOMETOUCH?
• Do I must use the additional power supply on hometouch?
• Do I must use ethernet cable for installation?
• Is my HOMETOUCH compatible with all My Home installations?
• Which is the communication between MyHOMESERVER1 and HOMETOUCH?
• Is it possible install HOMETOUCH and finish the commissioning without internet connection?