With my trackpad I never was able to get anything, I went to my ipod touch, but that screen is too small. I forgot to try my android phone, but the touch worked.
"The most exciting phrase to hear in science, the one that heralds new discoveries, is not Eureka! (I found it!) but rather, 'hmm... that's funny...'" Isaac Asimov
Useful Science software: http://www.helixsuite.com/