ACEHASyncTag point source?

We have five ACE calculations deployed in our system . While searching for tags,I found these with a descriptor of "ACE HA Syncronization tag; do NOT delete: 

Tag Name                                                      Pt Source                    Pt Class                     Descriptor

0FB60D26-5034-470c-A5A6-020965173EE01x ACEHASyncTag                base            ACE HA synchronization tag; do NOT delete 0FB60D26-5034-470c-A5A6-020965173EE02x ACEHASyncTag               base            ACE HA synchronization tag; do NOT delete 0FB60D26-5034-470c-A5A6-020965173EE02xdefault  ACEHASyncTag   base           ACE HA synchronization tag; do NOT delete 0FB60D26-5034-470c-A5A6-020965173EE0scaleout ACEHASyncTag      base           ACE HA synchronization tag; do NOT delete

From the tag description, it looks like these tags are used for ACE monitoring in High Availability environment.I have couple of questions regarding these tags:

1. If these tags were created during ACE code deployement , then I should have five tags instead of four(one for each ACE routine).

2. We do not have HA environment and yet the tag is getting values. Two tags have current value (of 1) and rest have 0/Pt Created. How are these tags getting current values?

Note:Some of the context associated with ACE routines are out of service/error. We are using PI server 2010

Thanks,

Arti