Memory limitation

Two examples recently made me wonder if there is a limitation on the maximum of memory a program can use:

The first one is a program I've written in Delphi. It deals with matrices each of them using about 280MB of memory. If I create only 3 of them everything works fine, but when I create a forth one my program crash.

The 2nd example is a commercial FEM program (Flux2D by Cedrat). It allows its user to set the maximum amount of memory it can use. If I set it above 1GB, it crashes.

So, does Delphi or Windows XP put a limit to the amount of memory a single program can use?
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Relevant Pages

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