Navigating TMemo or TRichEdit

Can anyone tell me how I can cause a memo component to 'Jump' to a particular
line of text.  Sort of like a Goto.  (Delphi 2.0)  I didn't notice anyway to
do that from the documentation,  perhaps there's a WinApi call.  I have combo
box (similar to bookmarks) that a user can choose, and I would like the memo
to automatically scroll up or down to a particular location.

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