A: Delphi defines the following standard conditional symbols.
For example the following would compile in the correct uses statement in Delphi 2 and Delphi 3 respectively.
{$IFDEF VER90}
uses system, windows, oleaut;
{$ENDIF}
{$IFDEF VER100}
uses system, windows, comobj;
{$ENDIF}
The version numbers for Delphi 1, 2 and 3 correspond to version 8.0, 9.0 and 10.0 of the Object Pascal compiler. For additional information on conditional compiles and compiler directives see appendix B in the Delphi 3 users guide.
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