Printing with ShellExecute_()

[Karbon]

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ShellExecute_(0,"print",my_file.s,NULL,my_directory.s,0)

That will trigger a print of what ever file I specify - I'm printing PDF files. The problem comes when I try to loop that. There doesn't seem to be any set number where it start to fail, all I know is that when I try to loop this more than 3-4 times it doesn't print all the documents and almost never prints them in order.

Does anyone else have any idea about how I can print a list of PDf files?