I’m not a lawyer, but tend to travel a lot and had lots of conversations with border agents as a result :) My impression is that it’s primarily a question of pa

I’m not a lawyer, but tend to travel a lot and had lots of conversations with border agents as a result :) My impression is that it’s primarily a question of payment - if you travel to say Belgium to get paid by a Belgian company, then it’s work. If you’re there and your work is not really related to Belgium in any way, you are on a salary paid by a US company, then your purpose isn’t really work. The shades of gray start when your employer is being paid by the local company for your work. Many countries will allow you to attend meetings for a week or two, run demos, provide some on-site support, but staying for six months and working on site likely require a business visa.