Window Sash: Replacement sash are not handed.

Operators: Awning operators are not handed.

Hinges: Hinges are handed from the interior (inside) of the home.  If a hinge is located on the left-hand side of the window as viewed from the interior (inside) of the home, the hinge is left-handed.  

Locks: Lock mechanisms are handed from the interior (inside) of the home.  If a lock is on the right-hand side of the window as viewed from the interior (inside) of the home, the lock is right-handed. 

Lock handles and lock bezels: These are universal - they are not handed.

Trim Stops: Trim stops, when handed, are determined as viewed from the interior.