Cell ID Property - can I use it to store a value?

I have a possible use for the cell ID property.

I want to use it a bit like the 'tag' property VB developers will be familiar with.

Lets say :
cells(1,1).Value = "MyValue"
cells(1,1).ID = "My hidden value"

I understand the ID values are not persistent on save - but that's fine for what I want to do.

Does anyone have any experience of this?

I have it all coded and no issues so far - this is incredibly useful!!

Bear in mind if you try this you can only set the cell ID on an unprotected sheet.

This should be tip of the day
IMHO!