The VPLUS "sloforms" file is translated into a human-readable ASCII flat file describing the screen layout as well as field descriptions (including processing specifications). This file, in turn, is parsed into intermediate code on the target platform and interpreted by our VPLUS intrinsics.

Our intrinsics use the curses terminal I/O library to provided a character-mode representation of a block-mode screen. Other than using using the "normal" enter-key instead of the block-mode enter key, the screens appear identical. Field and terminal display attributes are maintained and the line-drawing set is supported. Line drawing support does differ based on the terminal selected. As you would expect, using an HP termtype gives better results than a VT220 terminal.

Up to 24-line screens are supported, with the 25th line showing the function key labels. If 26 lines are available, we will show two lines of key labels.