This command identifies a DSP file with a unique keyword string so that it can be automatically selected for interpretation by DSPINSTL. The final stage of DSPINSTL processing consists of one or more steps of DSP file interpretation. In each step, all the DSP files in the current source directory whose keyword strings match the keyword string for that step are interpreted.

The DSP file line that immediately follows the :KEY command line contains a key string that begins with the first nonblank character in the line and ends at the first blank character or the end of the line. There can be no embedded blanks within a key string. Key strings can be up to 64 bytes in length. Here is an example of a :KEY command line:

    :KEY
    XYZ_800x600x16

There must be a single :KEY command line in each DSP file.