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<concept id="GUID-B526BA3A-14E4-53B4-9382-437475A1C8A4" xml:lang="en"><title>Patchable
Constants</title><prolog><metadata><keywords/></metadata></prolog><conbody>
<p>From version 9.3 of Symbian OS, DLLs can export certain constants.
These are referred to as patchable constants, and you can change their
values when the DLLs from which they are exported are incorporated
into a ROM image. </p>
<p>This gives you the ability to create a variety of ROM images with
constants of different values without the need to change any source
code nor to rebuild the DLLs. </p>
<p>You change the value of a constant when you build your ROM image
by adding the patchdata keyword into your <filepath>.oby</filepath> file. </p>
<p>See : Symbian^3 Tools Guide &gt; Building. </p>
</conbody></concept>