GetStdFilterProc
filter.
theProc pointer to dialog filter procedure pointer.
Notes: This routine is not yet documented in any MPW header file (hence, it is not
in any THINK C or THINK Pascal header file either). The information given
above comes from Macintosh Technical Note #304. This tech. note also gives
the inline glue for the call as follows:
= {0x303C, 0x0203, 0xAA68};