Q3.3.2: How do you have SXEmacs display the line number in the modeline?

Add the following line to your init.el file to display the line number:

(line-number-mode 1)

Use the following to display the column number:

(column-number-mode 1)

Or select from the Options menu Advanced (Customize)->Emacs->Editing->Basics->Line Number Mode and/or Advanced (Customize)->Emacs->Editing->Basics->Column Number Mode

Or type M-x customize RET editing-basics RET.