Language Reference Guide : System Classes : EntryField Class : BufferText Attribute
 
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BufferText Attribute
Data Type: nvarchar(2000)
4GL Access: R
When the field has input focus, the BufferText attribute contains up to the first 2000 characters of the field's edit buffer; that is, it contains the string that is displayed as the user types.
When the field does not have input focus, this attribute contains the field's current value.