Regulations, which do not consist wholly or mainly in the conveyance of signals on electronic communications networks; 3(b) of 112(I) of 2016. “electronic mail” means any text, voice, sound or image message sent over a public communications network, which can be stored in the network or in the terminal equipment until it is collected by the recipient; “electronic programme guide” means any electronic means of providing information to the public in relation to the schedule of programme material which is the subject of any broadcasting service and which is an integral part of the distribution and reception system by which the broadcasting service is provided; “end user” means a user not providing public communications networks or publicly available electronic communications services; 3(b) of 112(I) of 2016. “enhanced digital television equipment” regional terminal equipment which is intended for connection to a television set or advanced digital video device, and is able to support digital interactive television services, “equipment class” means a class identifying particular types of apparatus which are considered similar and those interfaces for which the apparatus is designed and which may, in any case, belong to more than one equipment class; 4(o) of 160(I) “Essential requirements” means general non-economic reasons that must of 2013. be fulfilled by suppliers of postal services. These reasons are the confidentiality of correspondence, security of the networks as regards the transport of dangerous goods, the respect for the terms and conditions of employment and social security schemes, laid down by the Law and/or by collective agreement negotiated by the social partners, in accordance with 31