1.

Rashi #1: It is an expression of speech, like "Niv Sefasayim" (Yeshayah 57:19).

2.

Rashi #2: It is an expression of moaning, like the Targum of Teru'ah 'Yebava' (Vayikra 23:24).

3.

Rashi #3, Radak citing Targum Yonasan: It is an expression of seeing - "b'Vavas Eino" (Zecharyah 2:12).

1.

Rashi: It is a window.

2.

Malbim: It is a window via Chachmah, She used magic to infer what happened to him. She saw him dead, and moaned.

Malbim: Bush is a delay more than is proper. Me'acher is after a fixed time.

1.

Malbim: They are runners to inform what happened to [his army]. Targum Yonasan - they bring a letter about the victory.