Symbol PDT 8100 Series Product Reference Manual page 268

PDT 8100 Series with Windows Mobile 2003 Software for Pocket PCs Product Reference Guide
RegMerge.dll
RegMerge.dll is a built-in driver that allows registry edits to be made to the Windows CE
Registry. Regmerge.dll runs very early in the boot process and looks for registry files (.reg
files) in certain Flash File System folders during a cold boot. It then merges the registry
changes into the system registry located in RAM.
Since the registry is re-created on every cold boot from the default ROM image, the
RegMerge driver is necessary to make registry modifications persistent over cold boots.
RegMerge is configured to look in the root of two specific folders for .reg files in the following
order:
\Platform
\Application
Regmerge continues to look for .reg files in these folders until all folders are checked. This
allows folders later in the list to override folders earlier in the list. This way, it is possible to
override Registry changes made by the Platforms partitions folders. Take care when using
Regmerge to make Registry changes. The DCP for PDT8100Xw contains examples of .reg
files.
Note: Regmerge only merges the .reg files on cold boots. The merge
process is skipped during a warm boot.
Typically, do not make modifications to registry values for drivers loaded before RegMerge.
However, these values may require modification during software development. Since these
early loading drivers read these keys before RegMerge gets a chance to change them, the
mobile computer must be cold booted. The warm boot does not re-initialize the registry and
the early loading driver reads the new registry values.
Do not use Regmerge to modify built-in driver registry values, or merge the same Registry
value to two files in the same folder, as the results are undefined.
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