DFM down at start of trading week

The video tutorial provides initial instructions to proceed, followed by a pause and details about a ticket number, specifically mentioning 'He 20'.

What does the command 'please proceed' imply in a ticketing context?

In what situation would you use the command 'Stop'?

What should you do after receiving a ticket number?

How would you interpret the phrase 'Ticket number. He 20.'?

What actions are typically taken after a ticket number is issued?