TRACE0 ("What is this?")

I have read the help of TRACE in a book, but could no appreciate, why do we use it?
I have written TRACE0("What is this") in a program; When i debug and move step-wise over this line, nothing happens?
Can somebody help me why and when do we use this macro. How does TRACE helps in debugging?
thankx

Hi,

the output of the TRACE macros is shown in the Output window in the IDE. It's useful if you want to see for instance the order in which your message handlers are called and you don't want to use breakpoints, or want to display the content of variables and something else.



Martin