Language Monitors and Bi-directional Printing: What functionality is lost when disabling? What else uses them?

Server OS: Windows 2008 R2 Standard
Function: Primary Domain Controller and Print Server
Clients: All are running Windows 7 Pro 64-Bit SP1

We're considering disabling the HP Universal Print Driver Language Monitor and in-turn Bi-directional Printing due to potential server spooler instabilities, before we do this the IT Manager wants to be sure:

1. What functionality is lost when disabling Language Monitors and Bi-directional Printing?
2. What else uses Language Monitors and Bi-directional Printing them? In other words what may break?
3. What specifically do Language Monitors and Bi-directional Printing provide?

Thanks