Alternate Data Streams

echo "text" > <file>:<StreamName>	Create/overwrite ADS
Set-Content <file> -Value "text" -Stream <StreamName>	Create/overwrite ADS
echo "text" >> <file>:<StreamName>	Append data to ADS
Add-Content <file> -Value "text" -Stream <StreamName>	Append data to ADS
echo "text" >> <file>:<StreamName> "more stuff"	Append "text more stuff" to the stream (note the space)
Clear-Content -Path <Path\FileName> -Stream <StreamName>	Clear ADS

You can add more than one stream to a file.