Pointer to class-specific control data, beginning with a value conforming to a USHORT data type, which specifies the overall length of the data.

There are several different types of control-data structures:

BTNCDATA

Button control data
ENTRYFDATA
Entry field control data
FRAMECDATA
Frame control data
MLECTLDATA
Multi-line entry field control data
SBCDATA
Scroll bar control data.

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