     ltrapi    
       LTR-EU, LTR-CU, LTR-CEU   Delphi.

      "Delphi 7" (ltreu_marks_delphi.dpr)  
 "Embarcadero RAD Studio" (ltreu_marks_delphi.dproj).

       ltrapi.pas, ltrapidefine.pas,
ltrapitypes.pas  ,   
  ltr      
(LTR_INSTALL_DIR/include/pascal2).

    :
    Delphi 7    - "Project->Options->Directories/Conditionals->Search path",
    RAD Studio  - "Project->Options->Delphi Compiler->Search path"