>I am planning on handling everything programmatically once the user’s preferences are determined. This seems very workable if none of the AmyUni functions require UI at the time they run.
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>Currently the app prints the VFP reports to individual disk files and concatenates them into a single string before sending them to the printer or fax. Performance is not a problem (read: printing doesn’t slow the user down <g>.) Can I expect the AmyUni drivers and concatenation process to work at about the same speed? I guess if things do start bogging down at the workstation level, the individual pages could be passed to an application server for concatenation and output.

Since disk access takes a relatively long time, I would guess that concatenating the output of one report to the previous one would take much less time than writing them individually, and then concatenating them (basically writing to disk twice for each report)... but I have not tested.

Why not test it yourself? They have a free download which puts their watermark across each page - fully functional otherwise (Be sure to get the 'PDF Converter' not the 'Creator' - confusing product names).

Once again... use the ActiveX method rather than the FLL.

Good luck.