Included for backward compatibility. Use the TextBox Control instead.
This command is undocumented in the original VFP9 help file,
but the following documentation was found in the FoxPro for Windows 2.6 help, and may still be valid:
Specifies a window in which memo fields are edited.
SET WINDOW OF MEMO TO window name
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Parameters
window nameSpecify the name of the window in which you want to edit the memo fields with window name.
Remarks
SET WINDOW OF MEMO is included for backward compatibility. Use @ ...EDIT instead.
Use SET WINDOW to edit memo fields within a user-defined window. You can then open the memo-editing window by issuing @ ... GET,APPEND, BROWSE, CHANGE, EDIT, or MODIFY MEMO. The user-defined window in which the memo editor is placed must be defined before you include it in SET WINDOW OF MEMO.
To edit a memo field within the specified window, move the cursor to the memo field and press Ctrl+Home, Ctrl+Page Up, or Ctrl+Page Down, or double-click the memo field.

Microsoft Visual FoxPro 9 SP2 Help file, VFPX Edition v1.08