computing device user interface, comprising means of performing a number of applications, these means including in particular a first execution space virtual machine / operating profile (100, P1, 200, P2) and a second execution space VM / operating profile (100, P1, 200, P2), the two execution spaces hosted by the same physical processing means (400) is arranged to be non-cleavable into two parts without destroying the physical medium treatment (400), each housing space implementing some applications (110, 120, 130, 140, 220, 230), characterized in that the applications (110, 120, 130, 210, 220, 230) of the second execution space (100 , P1, 200, P2) are a non-modifiable by the user applications, while applications (110, 120, 130, 210, 220, 230) of the first execution space (100, P1, 200, P2) are some applications modifiable by the user, Mane ra applications of the second execution space (100, P1, 200, P2) are applications with a degree of specifically higher than the applications of the first execution space (100, P1, 200, P2) security; and because the virtual machine of the second execution space (100, P1, 200, P2) is different from the first execution space (100, P1, 200, P2), each of these two virtual machines associated with a single profile functioning.