\clmgf
The \clmgf statement specifies the first cell in a range of cells to be merged.
The Microsoft Help Compiler ignores this statement.
All cells between the \clmgf statement and a subsequent \clmrg statement are combined into a single cell. The left edge of the new cell is the same as that of the leftmost cell to be merged; the right-edge is the same as that of the rightmost cell.
This statement was first supported in the Microsoft Help Compiler version 3.1.
\clmrg