How are Android emulators arranged?

Question

Android

Good afternoon.

I noticed that android emulators (BlueStacks, NOX, Memu) allow you to change the IMEI number, and on the fly. At the same time, as people write, Android x86 cannot do this in any way. Since I am not an expert in the device of this OS (I only know that the IMEI data is stored in the radio module), how do the creators of android emulators get around this?

Secondly, on Android x86 the default is ([email protected]) :

uid=2000(shell) gid=2000(shell) groups=1003(graphics),1004(input),1007(log),1011(adb),1015(sdcard_rw),1028(sdcard_r),3001(net_bt_admin),3002 (net_bt),3003(inet),3006(net_bw_stats)@x86

A little shorter only for the root. Emulators have more capacious, normal names, how did they fix this?