The root module, a file with a psm1 extension, is given the same name as the module itself and will be nested directly under a folder that bears the module name.

When a module is installed into one of the folders in $env:PSModulePath, it may have the following structure:

Modules
| -- LocalMachine
     | -- LocalMachine.psm1

The module can be imported immediately by passing the path to the LocalMachine folder to Import-Module. If the module content changes, the module should either be removed using Remove-Module, or the Force parameter should be used with Import-Module.

The LocalMachine.psm1 file includes all of the functions that make up the module. The content of LocalMachine.psm1 is shown in the following example; the body of the functions has been omitted in this snippet:

function Get-ComputerDescription { }
function Set-ComputerDescription { }

All of the functions in a module are made available to a user by default. The names of the functions will be shown when Get-Module is run, shown as follows:

PS> Get-Module LocalMachine -ListAvailable

    Directory: C:Workspace

ModuleType    Version    Name            PSEdition    ExportedCommands
----------    -------    ----            ---------    ----------------
Script        0.0        LocalMachine    Desk         {Get-ComputerDescription, Set-ComputerDescription}

The example shows that both of the functions are exported. If either function is run, the module will be automatically imported.