Modem playing up? Software not working properly? If you've just got on line and you're experiencing problems, or you need information, e-mail .net's technical experts at knowhow@netmag.co.uk, with the subject line "Ask the Experts." Take a look at some of the responses this month on pages 40 and 41 of the magazine this month. Here are a couple of pieces of sofware mentioned in this section and in the expert advice sections.