Need help in simple qlikview script

[#1]

The script -

TABLE1:
LOAD * INLINE [
    F1, F2
    1, a
    2, b
    3, c
];

LOAD * INLINE [
    F1, F2
    4, d
    4, e
]
WHERE NOT Exists(F1)
;

I know SQL and the syntax for Qlikview's "where" confuses me. In "WHERE NOT Exists(F1)" F1 belongs to which table ?

[#2]

Is there also a web docs for this, like API ? Anyway, this is how I got there -

Help > Contents or WebView Help > Index tab > Enter search word.