Hi!
Thank you for your question.
HTTP messages can be sent to a device using a web browser's address bar, a (home made) web page, or an application that can send HTTP messages.
The address is similar to a normal webpage, so a URL.
Which message can be received and interpreted depends on the device in question. Please find the appropriate user manual in our Downloads section and locate the 'API' appendix near or at the end.
As an example, this command asks a CueCore3 at the default network address of 192.168.1.10 to jump its playback 1 to cue 3:
http://192.168.1.10/ajax/pb/01/jump=3For all the options and more examples, as mentioined: check out the manual.
Note: a response message will be sent back confirming the action. Allowing for interactive communication. Some programming required

Enjoy!