إِيَّاكَ نَعْبُدُ
You alone we worship. (al-Fātiḥah 1:5)
Placing the object iyyāka before the verb foregrounds exclusive dedication in the context of worship. Here the surrounding meaning establishes the restrictive force. Yet not every fronted object entails an absolute exclusion of all alternatives; fronting also serves attention, contrast, and other functions.
هَذَا الْبَابَ قَرَأْتُ.
This chapter I have read.
The focus may be on this particular chapter or a contrast with another. It does not necessarily mean that no other chapter has ever been read. A context-supported interpretation is stronger than a blanket rule.