1. Lets assume that you have 2 projects named ProjA & ProjB. ProjA with 5
tasks and ProjB with 8 tasks.
2. opened both projects and from Window menu clicked Arrange All. Now you
see both files split in the window
3. doubled clicked Task 2 from Proj A (or right click and chose properties)
4. clicked Predecessors tab.
5. clicked ID filed and entered the external link to Task 3 frpm ProjB
(<>\ProjB.publised\3 and then Pressed OK. You will noticed that in ProjA
there will be a dimmed task (this is the external task from ProjB)
Let me know if you got it