Defines starting with `d' in hexen

• DEFAULT_SAVEPATH src/m_misc.c:562
• DEMOMARKER src/g_game.c:1845
• DEVTYPE_CYBERMAN src/i_cyber.c:110
• DISTMAP src/r_main.c:513
• DOOMCOM_ID src/i_ibm.c:2425
• DOSMEMSIZE src/i_cyber.c:74
• DPMI_INT src/i_cyber.c:71