Is it possible to call a subroutine from another workbook?

I have a subroutine called TestSub in my "*Test Book.xls*" workbook.
open this book, then try to call subroutine (-TestSub-) in that book.

Code
-------------------
If frmDate.chkATime Then
Set wb = Workbooks("Test Book.xls")
If wb = Nothing Then
Workbooks.Open "C:\Test Folder\Test Book.xls", False, True
End If
Call TestSub
Workbooks("Test Book.xls").Close False
End I
-------------------


Is this even possible?

TIA,
DejaV

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