At a customer I found the ‘procedure’ application type in the menu. Didn’t have time to see what it was and what it does, but I don’t have it in my menu. Does anybody has used this and know more? Or did I miss something?
Your customer is a VIP scriptcase user. 
You can call a stored procedure with this …
Indeed. It appears that this option is selectable on SQLServer and MYSQL when you have a connection supporting stored procedures. Was new to me.