I want to obtain a normalised range of 0-1 for the outputs of the MouseState object. I preferably want this to work on different systems that may have different screen dimensions so simple dividing the output of MouseState by a hardcoded height/width isn't what I'm after.
I used to use the toxy/tot external to find the screen dimensions but now that this external has been disabled I wonder how it's now possible to do this.
Also! One last point: I am after the screen dimensions and not the pure data window dimensions.

Thanks for your help!

Just a thought, some script could find these dimensions, couldn't it? I'm no script guru, but I'm convinced that you can get this info with scripting. Using [shell] to run the script, and maybe [netreceive] (in combination with pdsend from the terminal) you could probably achieve what you want.
No idea though how you would go about it on windows.

Just did a quick search and wrote a script which stores the screen dimensions in a text file.

The script is called "get_dimen.sh" and it's the following two lines:
touch ~/Desktop/dimen.txt
xdpyinfo | grep dimensions > ~/Desktop/dimen.txt

To make this script executable you should type the following in the terminal:
chmod +x get_dimen.sh

If you run it you get a .txt file on your Desktop which includes the following:
dimensions: 1280x778 pixels (339x206 millimeters)

Now, I don't really know how to use only the dimension numbers, but there MUST be a way. Once you have those two numbers though, then you can run the following:
/Applications/Pd-0.46-4.app/Contents/Resources/bin/pdsend 3001 < ~/Desktop/dimen.txt

In Pd, you can receive these values from [netreceive 3001]. Just make sure that each number is followed by a semicolon. For example:
1280;
778;
This is my screen size.
You can imagine that I'm on OS X.

Cheers

@alexandros Thanks for the christmas present! I really wanted to avoid using scripts but I can see that this is a good solution for the moment so a huge thanks. I'll probably use regexp in the bash script to get the dimensions. Will post up the modified script once I get it working.
Thanks again!

Using regex (probably very inefficiently!) to get the dimension values:

#first script. shell from pd has no substring manipulation functionality!
string=`xdpyinfo | grep dimensions` #dimensions:     1028x325     (352x325 #mm)
firstNumberInd=`/usr/bin/expr match "$string" '\s*[a-z]*:\s*[0-9]'`
stripStart=${string:$firstNumberInd-1} #1023x325   (252x325 mm)
spaceInd=`expr index "$stripStart" \ ` 
numbers=${stripStart:0:$spaceInd-1} #1023x325
xInd=`expr index "$numbers" x `
width=${numbers:0:$xInd-1} #1023
height=${numbers:$xInd} #325
echo "w $width;"
echo "h $height;"

I am using the first characters in the echo as identifiers for either height or width.
This is great but my only problem now is that I still have to execute this script manually. I thought this would be easy to solve by using the shell object but it doesn't seem to like lines like this: stripStart=${string:$firstNumberInd-1} in which I'm using sub-strings.