Didn't test but you can normaly use UniqueInstance. It has component
for Lazarus IDE components palette and only this is LCL. Backend is
FCL. Just add UniqueInstanceRaw to your project "uses" section and
before application run, call:
begin
if InstanceRunning then
begin
ShowMessage('Application is already running');
Exit;
end;
application.createform(tmainfo,mainfo);
application.run;
end.
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