I set a hook 0f WH_KEYBOARD_LL, when it intercept the "Ctrl + F11" will
send message "WM_USER_CTRL_F11" to my program and my program will pop a
message box when it received the message, but I always receive the message
twice, so it always pop 2 message boxes, how to solve it?
Sometimes when I send out email messages - the person on the receiving end
receives my message twice. The IT dept has checked all of my settings and
they look okay. Since this does not happen all the time -- they are stumped.