DLL calls, and they interface that is a good procedure called Scanner

demo
....\appl
....\....\Unit1.dfm
....\....\Unit1.pas
....\bin
....\...\mytwain.dll
....\...\twain_appl.exe
....\dcu
....\mytwain.cfg
....\mytwain.dof
....\mytwain.dpr
....\needed_component
....\................\images.dcr
....\................\Images.pas
....\ProjectGroup1.bpg
....\twain
....\.....\gui
....\.....\...\TwainFrame.dfm
....\.....\...\TwainFrame.pas
....\.....\interface
....\.....\.........\DHTwainDLL.pas
....\twain_appl.cfg
....\twain_appl.dof
....\twain_appl.dpr
....\twain_appl.res
file_id.diz
twain.pas
Twainy.dcr
Twainy.pas
twainy.txt
twainy.upl
TwainyMsg.pas

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