In git (no documentation).

Memorandum about the syntax of the connections:

-M address_list
-Q address_list

where:

  address_list ::= address[,address,...]

  address ::= client_number[:port_number]
  address ::= client_name[:port_number]

  client_number and port_number are integers >= 0

  The default port_number is 0.

  client_name is a string where the first char is not a number
  (I can change it if it is a limitation)

Example with `CsOptions':

<CsOptions>
-odac ; etc
-+rtmidi=alsaseq
;; The default name of the client is 'Csound'
-+alsaseq_client="Csound ALSA Sequencer Test"
;; If there are spaces in the name of the client,
;; we can put it between the "..."
-M 20,"USB MIDI Controller:1",128:3,keykit:1
-Q LinuxSampler,LinuxSampler:1

;; Also the follow is valid
;; -M "20,USB MIDI Controller:1,128:3,keykit:1"
;;
;; Here is an extreme example that uses the characters ','
;; and ':' in the name of the client.
;;
;;   -M "Uno\,Due\,Tre\:4"
;;
;; The name of the client is Uno,Due,Tre:4 and the port is 0.
;; Idem but the port is 1 (it also works without escape for ':')
;;
;;   -M "Uno\,Due\,Tre:4:1"
;;
</CsOptions>

tito