http://esamultimedia.esa.int/docs/issedukit/pt/html/subj4t.html#1
http://esamultimedia.esa.int/docs/issedukit/pt/activities/flash/start_toolbar.html#ex10_lec01.swf
http://esamultimedia.esa.int/docs/issedukit/pt/activities/flash/start_toolbar.html#c4_p47_02.swf
http://esamultimedia.esa.int/docs/issedukit/pt/activities/flash/start_toolbar.html#ex07_lec01.swf
http://esamultimedia.esa.int/docs/issedukit/pt/activities/flash/start_toolbar.html#c4_p48_01.swf
http://esamultimedia.esa.int/docs/issedukit/pt/activities/flash/start_toolbar.html#ex07_gm01.swf
http://esamultimedia.esa.int/docs/issedukit/pt/activities/flash/start_toolbar.html#ex10_lec01.swf
http://esamultimedia.esa.int/docs/issedukit/pt/activities/flash/start_toolbar.html#c4_p47_01.swf
http://esamultimedia.esa.int/docs/issedukit/pt/activities/flash/start_toolbar.html#ex05_lec01.swf