' Register OrdoPDFMerge.dll in Windows
' Add OrdoPDFMerge to the References of your project

Private PDFM As PDFmerge
'....
Set PDFM = New PDFmerge
Dim bReturn As Boolean, SelectedPDFsFile As String, PDFFinalDoc As String, m_PassWord As String
SelectedsPDFFile = "paths and names of the PDF files to merge, separated by commas"
PDFFinalDoc = "(optional) path and name of the resulting PDF file" ' If empty, the files are appended to the first file.
m_PassWord = ""
bReturn = PDFM.MergePDFs(SelectedPDFsFile, PDFFinalDoc, m_PassWord)
Set PDFM = Nothing