Solved it thanks to the link of bummi
Thank you very much.
Quote:
How to change NET DIR programmatically so it persists
[...]
You should also remember that if you have programs that change their own NET DIR locations at runtime, using either the DbiSetProp function or the NetFileDir property of a TSession component, this will override the NET DIR value in the configuration file.
It pointed me to the possibility of changing the NET DIR in code:
Session.NetFileDir := MyCustomTempDir;
After doing that, Table1.active := true
works and the data shows up in a connected TDBGrid
.