Hi!
anyone who can explain to me how to get the Arduino to respond on LgLcd.dll?
i have a couple of games/programs wich is compatible with the Logitech G15 display. but i don't have that keyboard. so i'm currently working on how to get Arduino + 126*64 LCD to show the same things that programs use LgLcd.dll to "talk" to the keyboards display 
I think this is asking too much for an Arduino. There are too many unknowns here. Like what hardware and software are behind the G15's LCD that drives it and allows it to communicate to the PC. I've tried to search online for people who may have removed one of those screens from the keyboard and use it in another project. But all the hacking and modding that has been done with the screen keeps it in tack. Mostly its various software tweaks allowing it to display different information.
Oh... That's to bad xD maybe i shall invest in a G15/G19 like you said i found nothing on the web in this subject...
Then isn't there a project simmilar to this to show temperature etc?
In that case cant you make an dll injection or something to show game information? Or an addon for example an addon for world of warcraft that sends info about the character via (for me) COM3.
There are ways you can get the information from the PC to be used or displayed threw the Arduino. But you may need to do some coding on the PC side to get it to work. That code would have to be able to get the information you want or be able to use the .dll file and then send that data threw the proper serial port to your arduino. Then the arduino would have to translate that data and present it accordingly. It is possible i just couldn't begin to tell you where to start. Like i said before there are too many unknowns with how the G15's display works. If you could figure that out it would make programing things allot easier.
well that's true.
man... i feel as such a newbie at the moment :-/
I have NO idea how to interfere with DLL's more that inject existing ones...
any good sources on DLL creations and how to use them?
and do you think Processing is good enough? or do you think i should make the program to send to the arduino with C# or c++? :-/
I don't think you understand what a DLL is.
You'll program your Arduino threw the IDE as usual. Then you'll need software on the PC that can assess the data your wanting to output to the LCD. That program then needs to send that data over serial to the Arduino. Then the arduino can take that data and display it. You may not even be able to use the DLL file you have in mind. But that all depends on you skills in programing a PC. What language you use for that doesn't really matter as long as you send the data threw the right com port to your arduino.
Hmm... I understand. Then this should not be a problem. Just need to freashen up my memory from pc programming xD