@midi I hope this helps......... udp.zip
Done in a rush and I am away for the next 24hrs.
Please post again if it is not what you need and I will help when I return...... or someone else will chip in before then.

The message sent back cannot be a port chosen at random by the server as the client will not know on which port to listen.
But you could send an osc message to the server telling it to which port it should connect.
That would mimic a browser requesting information from a server over http.
David.

@midi You specify the port for [udpsend] by sending in a connect message...... at top left.....

[connect localhost 9997( would be exactly the same....... connect to port 9997 on the local computer.

What makes you think a random port will be assigned somewhere?
A random port can be opened by an ftp program or similar, but it would have to tell the receiving socket which port to send back on.
In Pd you can always specify the port.

You should not get errors because udp does not care whether the message is received.
David.

@midi There are different ways depending on the object making the connection.
For the object you are trying to use.... right click it and open it's help file to see the method.
Ports should be set above port 8000 to be as certain as possible that they are not already allocated to another program.
If you are still having problems then post which udp object you are using........ [udpsend] ?? [netreceive] ?? etc.
David.

@jameslo pd.exe and pd.com seem to work the same for multiple instances.
They open the wish program as they are started.
I always use pd.com loaded by a batch file for my live shows with Asio4All for some reason that I can no longer remember.
(That's a bit frightening....... sometimes I fall over my posts from only a year ago and I don't remember even knowing the information I posted!)
The Asio4All driver remembers it's settings for executables that call it, so that they can be different for each program.
Maybe once the hook is into one pd.exe the 2nd instance is ignored.
Maybe try one pd.exe and one pd.com in the batch file?
Two instances of wish.exe are also opened, and the ports automatically adjusted
I will have to open my suitcase and dig out some asio devices.

Messaging is easy between the two instances.
Audio could be streamed between the two instances through the net library [udpsend~] and [udpreceive~] that work well over a local network with a bigger block size and should be perfect on the same computer with a blocksize of 64..... ?.... hopeful maybe?..... that is the possible stumbling block (pun) that needs thoroughly testing.....
David.

@rayinoak To use the files on his site you will have to do the same as with Pd files uploaded to this forum.
Copy the contents (select all, copy) into a basic text window, save it and then change it's name to what_you_want.pd
In windows a .txt file will work.
In other os's I don't know, but any file that tries to format the text when it is saved (such as word .docx and probably Mac .rtf)) will corrupt the file.
David.

@cfry maybe.zip
It depends.
The notes will get quieter as they fall in pitch, but less so if the "amount" fader is moved toward "less".
I have added the same feature to the velocity just in case.
David,

@RayManiac [image] should work.
It even works with a png file if it is named (dot)pg ..... bug?
It is also buggy in that you must be careful where you place other stuff.
If you put something below the image as in the screenshot below it will disappear, and the image will crash tcl with a cannot find the png message.
What is in this zip works on my machine (win7 pd 0.50).
imagine.zip
It is in the ggee library
David.

@cfry scale.zip
Abstraction using [expr] from the jmmmp library.
David.

@jameslo I think they all return something as well to [r pd]. I have not checked though.
dsp certainly.
But whether the message is useful is uncertain.
E.G....... [finderror( returns "last known error:" and highlights it in the patch. But I cannot think of a use for the message.
"ping" I have found most useful with arrays....... but it is apparently not sent in osx as an array is changed with the mouse.
Maybe it's time to document such stuff.
David.

@jameslo Nowhere........ http://puredata.info/docs/tutorials/TipsAndTricks
although that link shows all the embedded messages to/from pd (gimme means "list")

Well, pd-dsp-started can be found in the [samplerate~] help file......

..... and there is pd-dsp-stopped as well as the older but still current messages directly from pd....... the ones not documented as acknowledged in the link above......