Windows "What's This?" feature

How do you implement  the windows "What this?" feature in Delphi apps to provide fast and easy help to users.
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pdgxpertConnect With a Mentor Commented:

jeurk was sorta on the right track...

if you are planning on making a help file for your application, you will notice that you have the option of creating HelpID's which are links to specific topics and/or pages within your help file.

in order for the "?" (biHelp) button to work you must have a component with a HelpContext property... in this, type the number of the HelpID you would like associated...

when the user clicks the "?" then the object they would like to recieve the context help on, your program will generate an OnHelp event that will display the contents of that page, in a nice little floating window like other progs.

>> remember to associate the help file with your application... otherwise this will not work  
Add a button with a nice '?' icon and
Place in the OnClick event of the button the following code:
You can create a hintwindow like this:

var hw: THintWindow;

hw := THintWindow.Create(Self);
hw.Color := clInfoBk;
hw.ActivateHint(Rect(300, 300, 500, 400), 'Put your text here...');
You can paint the button in the WM_NCPAINT message handler. And in the WM_NCLBUTTONUP message handler you can detect the click. Is there someone who knows how to do this easier?
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