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There are no TV Guides to sort through the 5,000 discussion groups or the 2,500 electronic newsletters or the tens of thousands of computers with files to share . Electronic technicians perform maintenance on all electronic equipment in our communications network to include : HF transmitters and receivers , digital terminal devices , cryptographic equipment , satellite terminals , and computer systems . Services include both electronic imaging and microfilming . Digital libraries are one example of such services ; numerous other examples of such services may be found in emerging electronic commerce applications . However such electronic enhancement has had a valuable role as an adjunct to physical events , and since 1995 , many international scientific conferences have had offered a Web component.26 This can range from making available before the start an electronic book of abstracts , an electronic registration desk at which participants could supply their personal details , and obtain travel and tourist information .