fastrand()
    Generates a pseudo-random number.  The seed value is taken from
    stack, shifted left one position, exclusive-or'ed with hex value
    $1D872B41 and returned.

rangerand()
    RangeRand() accepts a value from 1 to 65535, and returns a value
    within that range (a 16-bit integer).  Note that this function is
    implemented in C.

fclose()
    Closes a file.

fgetc()
    Gets a character from a file.

fprintf()
    Prints a formatted output line to a file.

fputc()
    Puts character to file.

fputs()
    Writes a string to file.

getchar()
    Gets a character from stdin.

printf()
    Puts format data to stdout.

putchar()
    Puts character to stdout.

puts()
    Puts a string to stdout, followed by newline.

sprintf()
    Formats data into a string (see Exec rawdofmt() ).