HP b2600 Reference Manual page 22

B
glBegin
Execution of glEnableClientState, glDisableClientState, glEdgeFlagPointer,
glTexCoordPointer, glColorPointer, glIndexPointer, glNormalPointer, glVertexPointer,
glInterleavedArrays, or glPixelStore is not allowed after a call to glBegin and before the
corresponding call to glEnd, but an error may or may not be generated.
See Also
glArrayElement,
glCallList,
glCallLists,
glColor,
glEdgeFlag,
glEvalCoord,
glEvalPoint,
glIndex,
glMaterial,
glNormal,
glTexCoord,
glVertex
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Chapter 2