If you are familiar with their previous releases of Virtual CDU for iFly 737, PMDG 737/777 and Aerosoft airbus there is now a new program to the new iFly 747 v2
What it does: Lets you use your tablet or iPad for a touchscreen CDU. It is very responsive and does the same thing as a $500+ hardware CDU. It will also work on the upcoming P3Dv2 version as well
https://play.google.com/store/apps/details?id=com.virtualavionics.vcdu747
Can't say enough good things about their apps - best $20.00 addon you can get for these aircraft.