PAT, the RSX-11 object module patch utility, allows you to patch or update code in a relocatable binary object module. PAT accepts a file containing corrections or additional instructions and applies these corrections and additions to the original object module. The general form of a PAT command line is: [outfile]=infile[/CS[:number]],correctfile[/CS[:number]] where: outfile is the file specification for the output file. If you do not specify an output file, none is generated. infile is the file specification for the input file. This file can contain one or more concatenated object module. correctfile is the file specification for the correction file. This file contains the updates being applied to a single module in the input file. CS specifies the Checksum switch, which directs PAT to generate an octal value for the sum of all the binary data comprising the module in the file to which the switch is applied. number specifies an octal value that directs PAT to compare the checksum value it computes for a module with the octal value you specify as number.