Roland User wrote on Today, 22:07:

Thank you )
In all , is it possible create program whitch will be report to Windows about available how much MIDI portrs in system without use dll , drv , sys files ? I mean what we do run software and in system ports appear via which we can translate MIDI streaming and via which we can get MIDI streaming , but if close application , so all ports erasing from system , so do possible ?

No, you have to write or use a driver component to do this. BTW, even your current beta application needs to use and actually uses a driver component, namely teVirtualMIDI to create ports.
This is the same driver component used by LoopMidi. So If you want a permanent virtual cable you should use LoopMidi instead. You will get the same engine.

And this I want avoid , in ideal situation program must create ports at all without dirvers , how application create files or folders ) , and I want understandin , this generally possible or this impossible )

Roland User wrote on Today, 22:24:

And this I want avoid , in ideal situation program must create ports at all without dirvers , how application create files or folders ) , and I want understandin , this generally possible or this impossible )

As I said no, it is not possible to create even temporary Midi ports without a driver component.

Thank you )
Unfortunately I do not understand in drivers , for me even software logic not always cleary )
But I was try )
By the way , what I do not like in solution from Hermann Seib , so that in he solution limit quantity ports and names ports hard limits in names , him solution may be much better if Hermann Seib added options free quantity of ports and free names for ports ) and then this solution will irreplaceable )