Shoutbox

To facilitate updates and quick installations, you can notify
Messenger Plus! that you're going to install a new plugin. In that
case, Messenger Plus! will unload all its plugins, wait 5 seconds to
let you copy your DLL and reload the plugins. To trigger this event,
you have to broadcast a registered private message in the system.
The name of the message is "MessengerPlus_PluginChange". Example:
   UINT nMsg = RegisterWindowMessage("MessengerPlus_PluginChange");
   PostMessage(HWND_BROADCAST, nMsg, 0, 0);



This is a quote from the Readme file that comes with MsgPlus sdk...

so, u would put those 2 lines before u copy ur file. After 5 seconds, plugins will be reloaded...