Not directly.
You can use a process global flag for this.
For example if you need to close Activity1 from Activity2. In Activity1 add a process global boolean variable named: ShouldIClose.
In Sub Activity_Resume:
If ShouldIClose = True then
Activity.Finish
ShouldIClose = False
End If
In Activity2 set Activity1 flag to true when you want it to close.