AT&T 6300 Programmer's Manual page 186

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the Merge option is used, a MERGE

operation is performed with the current

program and the CHAINed program. The

CHAINed program must be an ASCII file.

any lines in the disk file have the same line

numbers as lines in the program in memory,

the lines from the file on disk will replace the

corresponding lines in memory. (MERGEing

may be thought of as "inserting" the program

lines on disk into the program in memory).

The MERGE option leaves the files open,

preserves the current OPTION BASE setting,

and preserves variable types and user-defined

functions, for use by the CHAINed program.

User-defined functions should be placed before

any CHAIN MERGE statements in the

program. Otherwise, the user-defined

functions will be undefined after the merge is

the MERGE option is omitted, the

CHAINing program is lost (except common

variables) before loading the CHAINed

program. CHAIN does not preserve variable

types or user functions. Thus, any DEFtype or

DEF FN statements containing shared

variables must be repeated in the CHAINed

the ALL option is used, every variable in the

current program is passed to the CHAINed

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