This structure is used in fn 4b05H (set execution state).

ExecStateRec
Offset Size Contents
                                                                 
+0      2  res          reserved
+2      2  wTypeFlags   0=COM, 1=EXE, 2=COM overlay, 3=EXE overlay
+4      4  pfszProgName Address of ASCIIZ  program name
+6      2  wPspSeg      Segment of the program's PSP
+8      4  lStartAddr   32-bit address of entry point (CS:IP)
+0aH     2  lProgSize    32-bit size of program, including PSP.
12               length of an ExecStateRec

- -

Exec State Record