For me it's Gold-K, which I achieve by defining the following function in my custom section:
procedure my_get_cursor_pos
column := get_info( current_window, "current_column" );
line := get_info( current_window, "current_row" );
message ( "Column !UL, row !UL", 0, column, line );
endprocedure;
and then in my tpu$local_init:
define_key("my_get_cursor_pos", key_name("K", shift_key), "Show cursor" );
As far as I can tell from searching sys$examples:*.tpu, there is no built-in eve_what_column function corresponding to eve_what_line.