On my home machine, (I use fvwm & _lots_ of screens), 
so I've just upped my local system with this:

*** old/src/sys/sys/syslimits.h	Sat Aug 20 23:07:00 1994
--- new/src/sys/sys/syslimits.h	Mon Nov 28 17:32:48 1994
***************
*** 38,44 ****
  
  #define ARG_MAX                 65536   /* max bytes for an exec function */
  #ifndef CHILD_MAX
! #define	CHILD_MAX		   40	/* max simultaneous processes */
  #endif
  #define LINK_MAX                32767   /* max file link count */
  #define MAX_CANON                 255   /* max bytes in term canon input line */
--- 38,44 ----

  #define ARG_MAX                 65536   /* max bytes for an exec function */
  #ifndef CHILD_MAX
! #define	CHILD_MAX		   300	/* max simultaneous processes */
  #endif
  #define LINK_MAX                32767   /* max file link count */
  #define MAX_CANON                 255   /* max bytes in term canon input line */

---
Julian Stacey