Apple TV Syncing ? want to know

[meashishnd]

apple imac have mac os 10.10.2 and itunes 12.1 - in itunes preference one icon is Apple tv showing apple tv is syncing
so first want to know which apple Tv is syncing because it showing only 1 apple tv and othe 2 apple tv not get syncing
whats syncing going on and how to check it
have 3 apple tv login with same apple id in premises in same network

 

[kch50428]

The only AppleTVs capable of syncing are not the 2 or 3...

 

[meashishnd]

thanks for replying #kch50428
Now sir tell me how to check whats content syncing between Apple Tv and itunes(iMac) !
if i remove apple tv from this menu then what happen may it occur to lose any content in apple tv or itunes or purchase items ?