understand triac data sheet ?

hello im a newb can some one explain to me what part of this data sheet refers to the voltage needed to allow current to flow on this triac Q6012Lh5 heres a link http://pdf1.alldatasheet.com/datasheet-pdf/view/122757/LITTELFUSE/Q6012LH5.html thanks for your time

Here http://www.littelfuse.com/data/en/Data_Sheets/Littelfuse_Thyristor_Qxx12xHx.pdf is a link to a proper datasheet for that device without all the crap that alldatasheet makes you go through. The parameters that specify what gate voltage and current you need to apply to turn it on are Vgt and Igt. Bear in mind that it is a 3-quadrant device, not a regular 4-quadrant triac.