Tag Print is used as part of the Physical Inventory process. First, the Tags for the items you are counting would be generated using Item Tag Create and/or Bulk Tag Create. Tag Print is used to print the Tags already created.
A complete physical inventory usually involves several steps:
o Delete/archive tags from the previous physical inventory
o Freeze inventory balances
o Create and print count tags (can be done before freeze)
o Enter initial tag counts
o Review results and enter recounts if necessary
o Void unused tags
o Update inventory balances
I would suggest reviewing the Inventory Control Training Guide in the document library for more details on the process.