AC is when the electrons flow in two directions, from the positive to the negative terminal and from the negative to the positive terminal, 'alternating' between the two directions. A lot of people think of electron flow as electrons moving along a wire freely like cars go down a highway.
To check the status of protected mode, choose File > Properties > Advanced > Protected Mode. Protected mode is enabled by default. To specify the settings, do the following: Choose Edit > Preferences. In the Categories list on the left, select Security (Enhanced). In the Sandbox Protections section, select or deselect Enable Protected Mode At Startup. Enable Create Protected Mode Log File to record events. The changes take effect the next time you start the application.
In Reader 11, Protected View is only supported when Protected Mode is enabled. There can be no HKCU or HKLM Protected Mode registry preference set to 0 (off) when Protected View is enabled. Installing Reader on a mapped network drive. Running Reader on WinXP when the OS is installed in a public folder. Launching Reader in XP-compatible mode on Vista and Win7.