Requesting dynamic concatenation

To request dynamic concatenation, specify concat at the beginning of the parameter string.

This function concatenates multiple DDs to a single DD. The DDs are concatenated in the order specified in the DDLIST key.

Table 1. Keys used for dynamic concatenation
Keys used for dynamic concatenation	Action
DDLIST(DDname1,DDname2[,DDnamex...])	Specifies a list of ddnames to concatenate to DDname1. Use this key with the CONCAT key.
DIAG (stem \| fdnum \| STDOUT)	Specifies that diagnostic information is to be displayed. The information includes a compile time stamp, the input string, key parsing information for subsequent keys, and the list of generated text units. Specify STDOUT to send output information to the standard REXX output stream.
MSG (WTP \| default.S99MSG.\| stemname \| fdnum)	Directs allocation messages to your job log (WTP), a REXX stem, or a file identified by a file descriptor number. If this key is not specified, messages are returned in the S99MSG. stem, if possible. If BPXWDYN was not called from a REXX environment, the messages will be lost.
PERMC	Specifies the permanently concatenated attribute.
SHORTRC	If the dynamic allocation fails, the dynamic allocation error code (S99ERROR) is returned in R15 and the information code is not returned. This is useful if the application can only process R15 as a halfword, such as with PL/I.