F-Lock

In early models, the state reverted to off at each reboot or keyboard reset, but later models retained F-Lock state across reboots.

First, the behaviour was unintuitive: pressing a key such as F4 by default no longer had its normal meaning, so combinations such as Alt+F4 appeared not to work.

[2] Pressing F2 in Windows Explorer in attempt to rename a file would instead undo an earlier file operation, with potentially disastrous consequences if the actual effect went silently unnoticed.

Because of such concerns, a number of methods for disabling the F-Lock function appeared on the web.

For example, assigning a macro {Press F1} to the function key F1 renders the F-lock issue moot, since the OS will interpret the key press as F1 regardless of the F-lock state.