From: Steve Teixeira <steixeir@borland.com>
Subject: Re: Sendkeys in Delphi?
Date: 27 Jun 1995 23:55:28 GMT

Essentially, what you want to do here is control other apps by sending 
wm_KeyUp/wm_KeyDown messages to a window, but there are two big problems with 
SendMessage and PostMessage:

1. You might not be able to easily find the intended receiver's window handle.

2. You could very well overflow the message queue with a long string.

The way you get around this is to use a wh_JournalPlayback Windows hook so that 
windows can play the keypress messages "on-demand".  It remedies the above 
problems because (1) the keys go to whatever window has focus (ie, "we don't 
need no steenking handles!"), and (2) Windows plays back the hook at its own 
pace, so your message queue is safe.

BTW, I put a Delphi version of SendKeys in Delphi Developer's Guide.

     -Steve Teixeira
      steixeir@borland.com