What does Guru Gobind Singh ji mean by 'siri mukh vak patshahi 10 '
This is at starting of Jaap Sahib
Ik ongkar satgur parsad. JAAP siri mukh vak patshahi 10 chapai chund. tav parsad.
Q1 is siri mukh the same as in this answer if not, what does it mean ?
Q2 What is the meaning of vaak ?
Q3 Does Sikh net has this in Shabad printer ?