>I have found this code in a VFP program - it only works on 1 machine in the network - do I need to install software on the other machines - if so what?
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>oXLS = thisform.OleControl1.object.document
>oExcel = oXLS.Application

It will error out on any machine which doesn't have excel installed. You can search UT for ways to check whether it is, and simply refuse to run this form if it isn't.