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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>