Findwindow & FindwindowEx Help

[NIGHT-FOX]

i used Findwindow Api and i got the handle i wanna but i want add to listbox the handle of each App like (i have 2 notepad opened ) Findwindow will get the first handle i want to know the first and the sec handl and add them to listbox to sendmessage for the selected ...

and i have a sec question :
how can i sendmessage as a keybord Event not as a char
And i tried this code for sendMessage F1

Call SendMessage(FindWindow("Notepad", vbNullString), WM_KEYDOWN, vbKeyF1, 0)
Call SendMessage(FindWindow("Notepad", vbNullString), WM_KEYUP, vbKeyF1, 0)

THX ...