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Unfortunately Borland didn’t implement a public register and start function into the class TServiceApplication. So we have to do it ourselves.
First we publish the protected RegisterServices function to allow (un-)install our service(s) programmatically.

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It is impossible to use SetThreadDesktop and the VCL at the same time because a thread can only show windows on one desktop at a time. However VCL is not written for the use with multiple threads, so there is no way to show Delphi forms of same process on two different desktops. SetThreadDesktop [...]

This answer is very easy - just use GetWindowThreadProcessId
JWA declares it as followed:

function GetWindowThreadProcessId(hWnd: HWND; lpdwProcessId: LPDWORD): DWORD; stdcall;

The function returns an identifier (not a handle) and also may set lpdwProcessId to the identifier (again not a handle!) if it is not nil. Be aware that identifiers aren’t handles, so you must not close them [...]

Please read this “How to” before submitting any Header Conversions to us.
Then you can submit the headers to mail@delphi-jedi.net

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The JWSCL does not need to be setup. The only setup is needed to create a binary unit file (DCU-file) for the JEDI API Headers as described here.
If finished make sure that you have added the source path of JWA to your project or general library path. After that you can also add the source [...]

The Jedi API Lib units can be used solely or just by including jwaWindows.pas.
1. Single units use:

If you want to use it solely you just have to set the compiler unit path to

\commond and
\win32API .

Thats all.
2. JwaWindows.pas and JwaVista.pas (also for the use with JWSCL)

There is also the possibility to use only one file that [...]