I ended up looking at the documentation that come with DBPro, tis the same function.
Quote: "SET BLEND MAPPING ON Object Number, Image Number, Blend Mode
SET BLEND MAPPING ON Object Number, Stage Index, Image Number, TexCoordMode, Blend Mode
Texture Coord Mode:
0 - Regular UV Stage Match
1 - Sphere Mapping UV Data
2 - Cube Mapping UV Data
3 - Steal UV Data From Stage Zero
10-17 - Take UV Data From Stage Mode Value minus 10
Blend Mode:
1 - D3DTOP_DISABLE
2 - D3DTOP_SELECTARG1
3 - D3DTOP_SELECTARG2
4 - D3DTOP_MODULATE
5 - D3DTOP_MODULATE2X
6 - D3DTOP_MODULATE4X
7 - D3DTOP_ADD
8 - D3DTOP_ADDSIGNED
9 - D3DTOP_ADDSIGNED2X
10 - D3DTOP_SUBTRACT
11 - D3DTOP_ADDSMOOTH
12 - D3DTOP_BLENDDIFFUSEALPHA
13 - D3DTOP_BLENDTEXTUREALPHA
14 - D3DTOP_BLENDFACTORALPHA
15 - D3DTOP_BLENDTEXTUREALPHAPM
16 - D3DTOP_BLENDCURRENTALPHA
17 - D3DTOP_PREMODULATE
18 - D3DTOP_MODULATEALPHA_ADDCOLOR
19 - D3DTOP_MODULATECOLOR_ADDALPHA
20 - D3DTOP_MODULATEINVALPHA_ADDCOLOR
21 - D3DTOP_MODULATEINVCOLOR_ADDALPHA
22 - D3DTOP_BUMPENVMAP
23 - D3DTOP_BUMPENVMAPLUMINANCE
24 - D3DTOP_DOTPRODUCT3
25 - D3DTOP_MULTIPLYADD
26 - D3DTOP_LERP
"
And yes, there are 2 definitions in DGSK
Big whorls have little whorls which feed on their velocity,
Little whorls have lesser whorls and so on to viscosity. - Lewis F. Richardson