ModuleSignature Property
Specifies a unique identifier for a merge module. The ModuleSignature contains the name of the merge module followed by a GUID.
Warning
Each released version of a merge module must have a unique ModuleSignature in order to avoid versioning problems. You should never manually edit the GUID portion of this property, instead you should use the GUID generation facilities in the Module Signature dialog box.
Remarks
This property is set in the Module Signature dialog box.