Linked graphics

[eNGiNe]

After generally fruitless Web searches, I'll post my latest questions here...

• some sources suggest that this mechanism uses absolute links, so if I move a .docx from one PC to another - same directory structure, same graphics files in a subdirectory - it will no longer find the linked graphic. True or false?

• working with linked graphics elsewhere, the graphic displayed in the document is automatically updated (I mean, it's a link ...) as soon as I change it in my graphics editor. I can't find an "update" option for linked graphics in Word: is there a workaround?

Thanks in advance!