Under the covers, PMX is two things: a library of node types for creating process components and a template structure for the nodes that make up an instance of a process module.
When you create an instance of PMX, you get a copy of the template structure which provides the following:
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A channel area to connect to an instance of the process client (a channel is the same as a connection, but without links to process client groups, which are not required in a process module).
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A data area to hold data.
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A library area to hold your configuration. The configuration is created using the component types from the PMX library.
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Settings to hold it all together.
You can install as many instances of PMX, or of modules based on PMX, as you need. Each instance will have its own copy of the template, i.e. it will have its own data and its own configuration.