AutoHotkey Community

File=-NETWORK DIR HERE-\data.txt ;Change this to what ever directory is being shared with the other computer.
Name:=A_ComputerName ;Comment this if you want to choose your own name in the chat. This is just to make things more simple.
;InputBox, Name, Username, Please enter a username. ;Uncomment this to choose your own name.
Gui, Color, FF8040
FileRead, Data, %File%
Gui, Add, Edit, ReadOnly -BackgroundTrans +Border vTextData w500 h500, %Data%
Gui, Add, Edit, vTextInput  x10 y515 w400 h100,
Gui, Add, Button, gSend x415 y515 w95 h100, Send
Gui, Show,, Network E-Chatter
WinGet Gui_ID, ID, A
SetTimer, ParseData, 500
Return

Send:
$Enter::
Gui, Submit, Nohide
IfWinNotActive, Network E-Chatter
{
   Send, {Enter}
   Return
}
If (TextInput = "/del log")
{
   FileDelete, %File%
   FileAppend,, %File%
   GuiControl,, TextInput,
   Return
}
FileAppend, %name%:`n%TextInput%`n`n, %File%
GuiControl,, TextInput,
Return

ParseData:
FileRead, Data, %File%
If (Data <> LastData)
{
   GuiControl,, TextData, %Data%
   GuiControl Focus, TextData
   ControlGetFocus ClassLog, ahk_id %Gui_ID%
   ControlSend %ClassLog%, ^{End}, ahk_id %Gui_ID%
   GuiControl Focus, TextInput
        TrayTip, New message!
        Sleep 500
        TrayTip
}
LastData=%Data%
Return

GuiClose:
ExitApp

IfWinNotActive, Network E-Chatter
{
   Send, {Enter}
   Return
}