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 Function parameter type conventions
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 The following table shows the data types used as parameters and return
 values from all Blinker functions. The one or two letter prefixes and their
 declarations for BASIC, C/C++ and Clipper are as follows:

 ni    signed integer       signed word numeric
 nu    unsigned integer     unsigned word numeric
 nl    long integer         signed dword numeric
 c     string               byte pointer character
 l     boolean              word logical

 (No type declaration is needed in the CA-Clipper language, but the passed
 parameters must be of the correct type).

 Logical (or Boolean) values are only directly supported for CA-Clipper. All
 other languages should use the numeric integer type, passing a zero value to
 indicate false, and a non zero value to indicate true. Return values from
 the functions use the same convention.

 For languages not listed, use the data types which match the C types.