You mean "IEIEIEIEIEIEIE". I think Natural and Artificial Harmonics are what you mean. Learn them here
Well, simply put on distortion, and play liek this: e--5--- b--5^7 g------ 5^7 = bend the string at fifth fret so that you get note of 7th fret.
I guess he can't mean pinch harmonics... I maybe wrong, but I've never heard Murray, Gers or Smith using squeals in their solos... So, I can't figure out what he's tryin to say... Clearly elucidate your point please.
if ur talkin about satch and vai well they mess around with thier tremolos do get that.but the kind of scream in maiden solos is wat alpha's told u.
@alpha ..aaah yes how could i forget that, i remember buggin u about it..: keep the gain high for this, slower the bend screamier it sounds but keep both the strings fretted during this time....even a vibrato instead of the bend will give u the same effect