Lester et al,

> > However, we have had trouble on a client site, where a 64bit terminal
> server acts as a client to a 32bit FB server. 64bit version of fbclient does not
> seem to work, while 32bit fbclient does.
>
> Do you really mean '64bit terminal server'?
> That can cause other problems when trying to run 'virtual' applications, so it
> may be that the application is not playing well on terminal server framework.

As others have said, and I will summarize/emphasize;

- Any client (32 or 64 bit) can talk to any Firebird server (32 or 64 bit).

- It is 32 / 64 'bitness' (?) of the client application which matters for the purposes of determining the 'bitness' of the Firebird client software must be installed on the client:
- A 32 bit application must use the 32 bit version of the Firebird client software;
- A 64 bit application must use the 64 bit version of the Firebird client software.

- A 32 bit application can be installed on a 32 or 64 bit OS, a 64 bit application can only be installed on a 64 bit OS. This also applies to Terminal Server/Citrix installs (they follow the same rules as any other client install).

- A 64 bit Firebird server must use 64 bit compiled UDFs.


Sean