https://www.gov.ie/en/department-of-social-protection/forms/pda1-certificate-for-a-posted-worker-in-the-eu-or-eea-under-eu-regulations-application-form-euw1/
PDA1 certificate for a posted worker in the EU or EEA under EU Regulations Application Form (EUW1)
This application form is used for employed persons posted to another EU or EEA member state.
https://www.ey.com/en_qa/functional/forms/download/posted-worker-eu-travel-compliance-rules
Posted worker EU travel compliance rules | EY - MENA
Posted workers and the return to business travel in Europe
compliance rulespostedworkereutravel
https://www.mondaq.com/austria/general-immigration/1466742/posted-worker-government-liaison-rules-relaxed
Posted Worker Government Liaison Rules Relaxed - General Immigration - Austria
Effective April 27, 2024, any individual permanently present in Austria may now qualify as the designated government liaison for posted worker matters.
government liaisonpostedworkerrulesrelaxed