Explain the statement below

function$1$ PROC USES esi ecx

The procedure functionl will use the registers esi and ecx without preserving their values.

The procedure function $1$ will save the current values of esi and ecx on the stack at the start and restore them before returning.

The procedure function $1$ is only allowed to modify the registers esi and ecx.

The USES directive indicates that esi and ecx are global variables