How to use prefix in PDF documents file names and "PDF per image" mode
This is Sample2.bat contents:
Bmp2PDFPilot.exe /E /A "Sample files\clock.bmp" "Sample files\globe.bmp" "Sample files\scheme.bmp" /O "Sample PDF files\" /P Sample2_
Files list to convert:
Sample files\clock.bmp
Sample files\globe.bmp
Sample files\scheme.bmp
Used required switches:
/O - required switch. Here it tells program create PDF files  in "Sample PDF files" directory
Used not required switches:
/A - auto open 
/E - "PDF per image" mode
/P - use prefix in PDF documents file names
Program create 3 PDF files from files:
clock.bmp, globe.bmp, scheme.bmp, located in directory "Sample files"
Prefix "Sample2_" is used. So files will be named:
Sample2_clock.pdf, Sample2_globe.pdf etc.
If output directory does not exist, it will be created.
When converting process is complete, output folder will be opened in Explorer window