how can I draw one Line in different windows？

[caiguosen]

I Want to draw one line in two windows， when I move my mouse in one window， I draw one line from top to bottom。 There is another window at the bottom of this window，I also want to draw one line in this window， if I Sendmessage to do it， It looks like draw two lines。

[Lost User]

You need to give some more details about this, the normal way is to capture the details of the line(s) in your program somewhere (e.g. on mouse moves) and then render the actual details in your paint procedure(s), and each window should have its own paint handler.

d@nish[^] has the answer.