This dialog has three pages:

Game Settings
game options. These options are configured in the host and take effect the next turn. This includes the option to set a result file password or rename your race, if allowed.
Options
most of PCC's options, grouped in a user-friendly way, with user-friendly editors. Most users use this part.
Configuration File
all of PCC's options, in the form as they appear in pcc2.ini files. This part is for experienced users only.
  • Enter: edit the currently-selected option
  • S: choose where the settings is stored:
  • Space: on the Options page: open a subtree
  • ESC: Close this dialog

Reference

Keys:
CtrlO on race screen