Why can't I find the T() and N() functions with offline help?

When I enter "t function" or "n function" (without quotes) in the
Search field, I do not see those functions. I always have to stumble
around to find them. For example, if I go to the TEXT() help page and
click See Also, I find the T() function. When I go to the T() help
page and click See Also, I find the N() function.

(The T() function appears in the list of Text and Data Functions, but
not the N() function.)

I wonder if the failure to find those functions by searching normally
indicates that they are deprecated and destined to become obsolete.

I am using Office Excel 2003.