If ISPCAPS is in effect,
then the values of variables and literals that are used as parameters
are passed to ISPF in uppercase.
If NOISPCAPS is in effect,
then the caller must ensure that the parameters are in the proper
case. The names of most ISPF parameters must be in uppercase.
The following example
shows two ISPLINK calls. The first turns on the ISPCAPS option. As
a result, the parameters that are specified in lowercase in the second
ISPLINK call are passed to ISPF in uppercase.
DATA _NULL_;
CALL ISPLINK('SAS','ISPCAPS');
CALL ISPLINK('display', 'dmiem1');
RUN;To display the current
settings of your ISPF options, use PROC OPTIONS GROUP=ISPF.