DDECommander is a simple visual basic application, which has two modes. The first is the command line, which simply takes the text entered and pushes it to mIRC. The other mode is via a GUI, which is the less preferable mode. I'm sure you can figure it all out. If you want the source, email me.
With the GUI if you choose to evaluate a command, it tries to send //showmirc -r | text user entered
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Yes they will, give it a whirl - Editplus tells when a file has been modfied and prompts you to reload it or not.
Yes :)
So, if you have more questions to ask frequently, email me.