>Rick: thanks for your advice. I am sorry to take more of your time, just one more question : I got an e-mail from Seaith Jacobs that suggest the following:
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>"First, if you haven't done so already, I suggest installing SP4 and using the Session class (part of VFP6 starting with SP3). By default, these classes are private data sessions. If you are using the Custom class (actually, any class but Form [setting the datasession to private] or Session), then all instances are in the global datasession."
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>Do you think is a goood idea to use the Session Class ?

I don't use it because it has a fair amount of overhead - ie. it's slow. I always use RELATION for my COM objects as they are the most light weight. Session loads all sorts of settings and sets up private datasessions, and the entire environment, which is expensive and not necessary as long as you handle the basic required multi-user settings (SET EXCLUSIVE, REPROCESS etc.) yourself in your objects.