Thank you, that is extremely helpful!

I looked at the application and there is no mention of where to send questions, unfortunately. The address to send applications is the generic search address where all of the job applications in that department go. Any thoughts?

I could a) email the person I have communicated in the past at that email address with, when I applied for a summer visiting position there, or
b) email my undergrad supervisor, who had originally forwarded the job to the email list which included my master's supervisor, who forwarded the position to me, or
c) just let it go and apply

Hi,
I am new here.
I am currently a PhD candidate and this is my first round of job applications. One of the jobs I am applying for is actually at the school where I did my undergrad, and the chair of the search committee was my undergraduate advisor. My question is, should I contact this person and let them know I am applying? Should I contact them and say anything else? How should I handle this?
Thanks.