Is GUID global unique?

Greetings,

if i create a MS-Project client file and I add a task, I can view a uniqueID. This uniqueID is only unique in the project file.

I want a uniqueID by a task that is - with a high probability - global unique.

I found the field GUID (with this content e.g. B526E49A-CD40-E511-BAFC-97BA30AC79BC)

Is the GUID "gloabal" unique?

Thank you!

    Michael