## Display Device Driver Reference for OS/2

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### Command Language PM Panels

During the final phase of DSPINSTL execution, each data-chain element triggers a separate DSPINSTL command-language interpretation step, using the command-language PM panels. One of these panels enables the user, optionally, to override the source directory to be used for this step. Another panel prompts the user to insert an appropriately labeled diskette. The remainder of the PM panels prompt the user when execution errors are encountered during this phase.