@jameslo Multicast is an address that all hosts on the network will listen to if they have joined a group.
So they listen for messages sent to their specific IP and also those sent to a multicast IP.
Multicast addresses are in a specific range and the host receiving has to join the multicast group.
There are also broadcast addresses for which no group has to be joined.
They are used mainly to say "hello..... I am here"..... to announce their presence on the network.
David.

@suppervieira No, but you can use [netreceive] with a specific port.
The computer Pd is running on will have an IP address and you can connect to "IP(of the computer):port(specified in netreceive)"
David.

@ddw_music Something happened on my MacBook pro running windows 7.
I had experimented running Pd 0.51.1 with wish 86....... to solve antialiasing problems with patch window rendering.
That worked...... but the patches are displayed within a wish 86 window that (at the time...... now unsure) could not be resized. The Gem window still created outside that window of course.... and I think that aliasing in Gem was "fixed".
I had also applied some rules for antialiasing from the graphics card control panel at the time so I am not sure.
Since then...... e.g. in Pd 0.49 with wish 85........ I have no (noticeable) aliasing in Gem 64-bit and don't need to set FSAA for [gemwin] or smoothing.

I cannot really help much as it was a while ago..... I can only give clues...... and I know that you have so many different platforms to deal with.
Good luck.
David.

@pluxite I think you will have to find another way.
The operating system will only send mouse events and coordinates to the program that has its window "on top". Which makes sense as otherwise you would have no idea what you are clicking.
David.

@NotAnder This thread might be helpful......... https://forum.pdpatchrepo.info/topic/13330/make-pd-ignore-dark-system-theme-on-ubuntu
Although it looks as though you will need to edit a .tcl file in the Pd/tcl folder.
David.

@nuromantix No...... it needs to be "/Applications/PureData/Pd.app/Contents/Resources/bin/pd -nogui open whole/path/to/patch/patch.pd"

But "open" might not be the Mac OSX command ....... or it might be correct.
David.

@nuromantix In windows you would add an "open" command to the line you have posted so for example......

"C:\Users\David\Desktop\Pd Vanilla\pd-0.48-1.msw\pd\bin\pd.exe" -lib C:\Users\David\Desktop\dot\0.94-test3/Gem  -font-size 10 -font-face "Consolas" -nogui open "C:\Users\David\Desktop\tcl_message.pd

But you will not be able to display the patch...... as that is the point of -nogui.
David.

@maddynakedymaddy This is not a foolish question.
But we don't see any questions as foolish...... because we all had to start from zero knowledge.

This is guesswork though......
As you are running extended I can assume you have windows 10 X 64 and can run 32-bit programs.
But you might well be missing some 32-bit executables that were never installed on a newer computer..
You should try installing a 32-bit "dot net framework" through "Visual C++" I think the file you need is msvcr100.dll but it could be another.
This is a screenshot from my "Program Files" in Win7.

The most likely version you need is either the 2010 or 2013 redistributable (x86) ...... or both.
Extended was released in 2013 but GEM was built before then.
Links for 2010 here...... https://social.msdn.microsoft.com/Forums/en-US/87fbf736-de36-46a2-a5f6-5be1485169e2/msvcr100dllhow-can-i-get-it-on-my-computer?forum=vssetup
and you can get 2013 and 2015 from the same site.
Check your control panel (if such a thing exists in widows 10) program files to see if they are missing.
There is no harm in having the (X64) ones and the 2015 (X86) as well if they are missing.

Of course if you already have those libraries then the problem is elsewhere.

When you one day try to use Spout you will also need msvcr110d.dll which you can add to the GEM library. Link here.......https://forum.pdpatchrepo.info/uploads/files/1486288696808-this.zip
David.

@suppervieira
You can change the send message if /hello "value" is not what you need.
i.e.
send /hello/id $1
or
send /id $1

David.

@maddynakedymaddy You are not the first to have this problem, and remembering your pix_image problem makes me think that installing Quicktime would help for both problems.......... https://forum.pdpatchrepo.info/topic/9114/unpack-object-pix_film-number-of-frames-not-showing-properly-showing-as-1
David.