We had out own system inhouse, but I've also used:

TrackIT

http://www.blueocean.com/smallbusiness/sproducts.asp

It used to be written in VFP using SQL as a backend. I don't know if it still is. If so, you can add on your own modules.

Tracy

>>Quickbooks?
>>
>>>I asked this question last week and was surprised by the lack of a response. So I thought maybe the planets were aligned properly and everybody was pre-occupied with other things. Let me ask it again and see what happens.
>>>
>>>We are software developers and have thousands of users. I'm just wondering what everybody else is using for invoicing (new orders and upgrades) and enduser tracking (contact information, serial#, version they have, upgrade info, etc.)?
>>>
>>>I must admit that we have developed our own internal software, but I'm thinking there must be commercial software that will do it better than we have???
>>>
>>>Feedback welcomed...
>
>
>Terry:
>
>How do you use Quickbooks to keep track of endusers??? The invoicing part I understand, but then how do you get the contact, serial, version, etc. into the "other" program???