If you create a new process without adding the environment block (by calling CreateEnvironmentBlock) the new process may fail to call Shellexecute and some other functions. Don’t think that the enviroment variables aren’t that important.
Find out more about CreateProcess in the post about “CreateProcess in full glory“.

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Did you know that handles are 64 bit wide in native 64 bit applications? While this doesn’t affect any Delphi developer just yet, things will change next year with the release of Delphi “Commodore” as outlined on CodeGear’s Delphi and C++Builder Roadmap page. This means, among other things, that type-casting a THandle or HANDLE from [...]

The WinSta0_DesktopSwitch Event allows an application to check for a desktop switch. The following examples demonstrates how we can wait for such an Event. To test it, simply lock and unlock the workstation. Both wait function will return on the two desktop switching.

uses

  SysUtils

  JwaWindows;

var H : THandle;

begin

  H := OpenEvent(SYNCHRONIZE, false, ‘WinSta0_DesktopSwitch’);

  if H [...]

If you include Forms and SvcMgr (Service classes) in the same project (in any sub unit) you may get a memory leak. It happens only if you call the Free method directly.

Forms.Application.Free;

To make it work, you have to check for a side effect that I describe here.
The memory leak results from the SvcMgr.TServiceApplication.Destroy destructor which [...]

A call to CreateProcessAsUser will fail with ERROR_INVALID_PARAMETER if your new process belongs to another session and you allowed inheritance of handles. In this case you have to set parameter bInheritHandles to FALSE.

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