When loaded, the font is used by subsequent GreCharRect, GreCharStr, and GreScrollRect calls to draw the character images for the appropriate AVIO set. lLcid identifiers LCID_AVIO_1, LCID_AVIO_2, and LCID_AVIO_3 correspond to AVIO sets 1, 2, and 3 respectively.

If the font is not acceptable for use with an AVIO presentation space, the handling routine returns FALSE to indicate an error. The font must be a fixed-pitch image (raster) font that matches one of the cell sizes for the default font. If the font does not match a supported cell size, the characters are displayed in the presentation space as black cells.

A possible approach is for the presentation driver to realize the AVIO fonts required and store the pointers to the fonts in the DC instance data structure.