Eshell Environment

[Christopher Howard]

Hello. I recently started playing around with Eshell. There is some
cool things about it, but the documentation seems a bit sparse. My
question: For non-builtin commands, how does Eshell know where to look
for commands? (More broadly worded: how does it set up the PATH and the
rest of the environement?) Also, when you switch to a directory on a
remote system (which eshell does via tramp) can you have the PATH
update somehow to allow use of commands on the remote system?