Needed: dynamic loading of code at runtime

[Ed_Batutis at oa.mceo.dg.com]

CEO summary:
I am looking for a way to call functions that are "bound at runtime" 
under UNIX.  This is similar to what an overlay loader would do under 
some operating systems.  The interface would be something like the 
following:  ExecDynamicFunction(MyFunction,param1,param2,...).
The routine would find MyFunction in a file, copy it into memory 
and call it with param1, param2,....  MyFunction is a string 
containing the actual name of the routine, which could be changed at 
runtime.  Desirable features include: MyFunction is implemented in 
shared memory so that there could be a shared data-space as well as a 
non-shared data space for all clients of the routine on a system.  
Functions could be grouped into Dynamic Libraries.  A good name for 
this facility would be Dynamic Link Libraries.  This is what OS/2 
calls them.  I'm familiar with CMU's Andrew System.  They have a 
pretty good implementation of this.  Any other candidates?