This is part of Win16 API which allow to create versions of program from one source code to run under OS/2 and Win16. Under OS/2 program can be running under Win-OS/2 if program is Windows NE executable, and with help on Windows Libraries for OS/2, if it is OS/2 NE executable. Here is a WLO to OS/2 API mapping draft
Returns the size, in bytes, of the free area in the current local heap.
WORD FAR PASCAL LocalCountFree(void);
This function has no parameters.
Returns the size, in bytes, of the free area in the current local heap. The “current” heap is the one whose data segment selector is loaded into the DS register at the time of the call.
In normal use, called from within a module, it returns the free space in that module's own local heap.
#include <windows.h> WORD wFreeBytes = LocalCountFree();
call LocalCountFree ; Returns AX = free bytes in current local heap