>The question was triggered by the following extract:
>
>The current version of PhDbase is multi-user, but it is not reentrant. This means that PHDBASE.V30, PHDBASE.V50 or PHDBASE.FLL may not be used in multiple instances of FoxProW or VFP on the same machine (but the same .V30, .V50 or .FLL may be used on different machines).
>ances of FoxProW or VFP on the same machine (but the same .V30, .V50 or .FLL may be used on different machines). If you need to run multiple instances of VFP or FoxProW with PhDbase, simply create a copy of PHDBASE.V30, PHDBASE.V50 or PHDBASE.FLL under a different name and load the "different" library under the second instance of FoxProW.
>
>Since product is unsupported ,I am not sure, what was meant by that. Presumably, if we manage to run almost simultaneous searches from different instances we may encounter reentrance problem.

This is not clear for me too. DLL may be not thread-safe, but I don't think that two separate Win32 applications can affect each other.