The sections 2 and 3 offences are intended to deter the more serious criminals from using a computer to assist in the commission of a criminal offence or from impairing or hindering access to data stored in a computer. The basic section 1 offence is to attempt or achieve access to a computer or the data it stores, by inducing a computer to perform any function with intent to secure access. Hackers who program their computers to search through password permutations are therefore liable, even if their attempts to log on are rejected by the target computer. The only precondition to liability is that the hacker should be aware that the access attempted is unauthorised. Thus, using another person's username or identifier (ID) and password without proper authority to access data or a program, or to alter, delete, copy or move a program or data, or simply to output a program or data to a screen or printer, or to impersonate that other person using e-mail, online chat, web or other services, constitute the offence. Even if the initial access is authorised, subsequent exploration, if there is a hierarchy of privileges in the system, may lead to entry to parts of the system for which the requisite privileges are lacking and the offence will be committed. Looking over a user's shoulder or using sophisticated electronic equipment to monitor the electromagnetic radiation emitted by VDUs ("electronic eavesdropping") is outside the scope of this offence.