Hi,
I have try DIRECTORY() and ADIR(). Both of them also will cause program/system hault. The following are the steps of my testing:

1. Connect PC to network
2. Issue DIRECTORY() / ADIR() /FCREATE() to check the existence of server.
3. In this test, all pass.
4. Unplug network cable from the pc.
5. Repeat step 2 again.
6. Program/system will be hault.

Any ideas? Any workaround to avoid system/program hault on this situation? Because the program will be used in supermarket and sales operations cant be stopped. If server is not existence during the time of business, all transaction will be saved in local.

Pls advise.

Thank you