[lightbiter]

Hide/Show Screen orientation icon
If you wish to hide the Screen orientation icon, shown in the task bar on some devices, you can set:
HKLM\System\GDI\Rotation\HideOrientationUI = 1 (DWORD decimal)
And to show it again:
HKLM\System\GDI\Rotation\HideOrientationUI = 0 (DWORD decimal)

If this doesn't work, you can try:
HKLM\Services\screenrotate = 0 (DWORD decimal)
And to show it again:
HKLM\Services\screenrotate = 1 (DWORD decimal)

Note that this icon and its feature may not be available on your device at all.


Hide/Show battery indicator in Task bar
If you wish to hide the battery indicator in the task bar on some devices, you can set:
HKLM\Services\Power\ShowIcon = 0 (DWORD decimal)
And to show:
HKLM\Services\Power\ShowIcon = 1 (DWORD decimal)

Note that this icon and its feature may not be available on your device at all. For example, the HTC Wizard regularly ships with a battery indicator in the Tray instead, governed by "Windows\Startup\Init_Tray.exe".