diff --git a/src/demon/linux/demon_core_linux.c b/src/demon/linux/demon_core_linux.c
index 6b6b7d2a..dd833704 100644
--- a/src/demon/linux/demon_core_linux.c
+++ b/src/demon/linux/demon_core_linux.c
@@ -536,166 +536,200 @@ internal B32
 dmn_lnx_thread_read_reg_block(DMN_LNX_Entity *thread, void *reg_block)
 {
   B32 result = 0;
+  switch(thread->arch)
   {
-    REGS_RegBlockX64 *dst = (REGS_RegBlockX64 *)reg_block;
-    pid_t tid = (pid_t)thread->id;
+    case Arch_Null:
+    case Arch_COUNT:{}break;
+    case Arch_x86:
+    case Arch_arm64:
+    case Arch_arm32:
+    {NotImplemented;}break;
     
-    //- rjf: read GPR
-    B32 got_gpr = 0;
+    //- rjf: [x64]
+    case Arch_x64:
     {
-      DMN_LNX_UserX64 ctx = {0};
-      struct iovec iov_gpr = {0};
-      iov_gpr.iov_len = sizeof(ctx);
-      iov_gpr.iov_base = &ctx;
-      if(ptrace(PTRACE_GETREGSET, tid, (void*)NT_PRSTATUS, &iov_gpr) != -1)
+      REGS_RegBlockX64 *dst = (REGS_RegBlockX64 *)reg_block;
+      pid_t tid = (pid_t)thread->id;
+      
+      //- rjf: read GPR
+      B32 got_gpr = 0;
       {
-        got_gpr = 1;
-        DMN_LNX_UserRegsX64 *src = &ctx.regs;
-        dst->rax.u64    = src->rax;
-        dst->rcx.u64    = src->rcx;
-        dst->rdx.u64    = src->rdx;
-        dst->rbx.u64    = src->rbx;
-        dst->rsp.u64    = src->rsp;
-        dst->rbp.u64    = src->rbp;
-        dst->rsi.u64    = src->rsi;
-        dst->rdi.u64    = src->rdi;
-        dst->r8.u64     = src->r8;
-        dst->r9.u64     = src->r9;
-        dst->r10.u64    = src->r10;
-        dst->r11.u64    = src->r11;
-        dst->r12.u64    = src->r12;
-        dst->r13.u64    = src->r13;
-        dst->r14.u64    = src->r14;
-        dst->r15.u64    = src->r15;
-        dst->cs.u16     = src->cs;
-        dst->ds.u16     = src->ds;
-        dst->es.u16     = src->es;
-        dst->fs.u16     = src->fs;
-        dst->gs.u16     = src->gs;
-        dst->ss.u16     = src->ss;
-        dst->fsbase.u64 = src->fsbase;
-        dst->gsbase.u64 = src->gsbase;
-        dst->rip.u64    = src->rip;
-        dst->rflags.u64 = src->rflags;
+        DMN_LNX_UserX64 ctx = {0};
+        struct iovec iov_gpr = {0};
+        iov_gpr.iov_len = sizeof(ctx);
+        iov_gpr.iov_base = &ctx;
+        if(ptrace(PTRACE_GETREGSET, tid, (void*)NT_PRSTATUS, &iov_gpr) != -1)
+        {
+          got_gpr = 1;
+          DMN_LNX_UserRegsX64 *src = &ctx.regs;
+          dst->rax.u64    = src->rax;
+          dst->rcx.u64    = src->rcx;
+          dst->rdx.u64    = src->rdx;
+          dst->rbx.u64    = src->rbx;
+          dst->rsp.u64    = src->rsp;
+          dst->rbp.u64    = src->rbp;
+          dst->rsi.u64    = src->rsi;
+          dst->rdi.u64    = src->rdi;
+          dst->r8.u64     = src->r8;
+          dst->r9.u64     = src->r9;
+          dst->r10.u64    = src->r10;
+          dst->r11.u64    = src->r11;
+          dst->r12.u64    = src->r12;
+          dst->r13.u64    = src->r13;
+          dst->r14.u64    = src->r14;
+          dst->r15.u64    = src->r15;
+          dst->cs.u16     = src->cs;
+          dst->ds.u16     = src->ds;
+          dst->es.u16     = src->es;
+          dst->fs.u16     = src->fs;
+          dst->gs.u16     = src->gs;
+          dst->ss.u16     = src->ss;
+          dst->fsbase.u64 = src->fsbase;
+          dst->gsbase.u64 = src->gsbase;
+          dst->rip.u64    = src->rip;
+          dst->rflags.u64 = src->rflags;
+        }
       }
-    }
+      
+      //- rjf: read FPR
+      B32 got_fpr = 0;
+      if(got_gpr)
+      {
+        Temp scratch = scratch_begin(0, 0);
+        DMN_LNX_XSave *xsave = 0;
+        DMN_LNX_XSaveLegacy *xsave_legacy = 0;
+        
+        // rjf: try xsave
+        if(!xsave_legacy)
+        {
+          U8 xsave_buffer[KB(4)];
+          struct iovec iov_xsave = {0};
+          iov_xsave.iov_len = sizeof(xsave_buffer);
+          iov_xsave.iov_base = xsave_buffer;
+          if(ptrace(PTRACE_GETREGSET, tid, (void*)NT_X86_XSTATE, &iov_xsave) != -1)
+          {
+            xsave = push_array_no_zero(scratch.arena, DMN_LNX_XSave, 1);
+            MemoryCopy(xsave, xsave_buffer, sizeof(*xsave));
+            xsave_legacy = &xsave->legacy;
+          }
+        }
+        
+        // rjf: try fxsave
+        if(!xsave_legacy)
+        {
+          DMN_LNX_XSaveLegacy fxsave = {0};
+          struct iovec iov_fxsave = {0};
+          iov_fxsave.iov_len = sizeof(fxsave);
+          iov_fxsave.iov_base = &fxsave;
+          if(ptrace(PTRACE_GETREGSET, tid, (void *)NT_FPREGSET, &iov_fxsave) != -1)
+          {
+            xsave_legacy = push_array_no_zero(scratch.arena, DMN_LNX_XSaveLegacy, 1);
+            MemoryCopy(xsave_legacy, &fxsave, sizeof(*xsave_legacy));
+          }
+        }
+        
+        // rjf: fill from xsave legacy
+        if(xsave_legacy)
+        {
+          DMN_LNX_XSaveLegacy *src = xsave_legacy;
+          dst->fcw.u16 = src->fcw;
+          dst->fsw.u16 = src->fsw;
+          dst->ftw.u16 = src->ftw; // TODO(rjf): old: fix tag word (?)
+          dst->fop.u16 = src->fop;
+          dst->fip.u64 = src->b64.fip;
+          // TODO(rjf): these 16-bit registers do not belong in x64
+          dst->fcs.u16 = 0;
+          dst->fdp.u64 = src->b64.fdp;
+          dst->fds.u16 = 0;
+          dst->mxcsr.u32 = src->mxcsr;
+          dst->mxcsr_mask.u32 = src->mxcsr_mask;
+          {
+            U8 *float_s = src->st_space.u8;
+            REGS_Reg80 *float_d = &dst->st0;
+            for(U32 n = 0; n < 8; n += 1, float_s += 16, float_d += 1)
+            {
+              MemoryCopy(float_d, float_s, sizeof(*float_d));
+            }
+          }
+          {
+            U8 *xmm_s = src->xmm_space.u8;
+            REGS_Reg512 *xmm_d = &dst->zmm0;
+            for(U32 n = 0; n < 16; n += 1, xmm_s += 16, xmm_d += 1)
+            {
+              MemoryCopy(xmm_d, xmm_s, 16);
+            }
+          }
+        }
+        
+        // rjf: fill from ymm registers
+        // TODO(rjf): this is a lie; ymm can technically move around. study & fix.
+        if(xsave)
+        {
+          B32 has_ymm_registers = ((xsave->header.xstate_bv & 4) != 0);
+          if(has_ymm_registers)
+          {
+            U8 *ymm_s = (U8 *)xsave->ymmh;
+            REGS_Reg512 *ymm_d = &dst->zmm0;
+            for(U32 n = 0; n < 16; n += 1, ymm_s += 16, ymm_d += 1)
+            {
+              MemoryCopy(((U8*)ymm_d) + 16, ymm_s, 16);
+            }
+          }
+        }
+        
+        got_fpr = (xsave || xsave_legacy);
+        scratch_end(scratch);
+      }
+      
+      //- rjf: read debug registers
+      B32 got_debug = 0;
+      if(got_fpr)
+      {
+        got_debug = 1;
+        REGS_Reg64 *dr_d = &dst->dr0;
+        for(U32 i = 0; i < 8; i += 1, dr_d += 1)
+        {
+          if(i != 4 && i != 5)
+          {
+            U64 offset = OffsetOf(DMN_LNX_UserX64, u_debugreg[i]);
+            errno = 0;
+            int peek_result = ptrace(PTRACE_PEEKUSER, tid, PtrFromInt(offset), 0);
+            if(errno == 0)
+            {
+              dr_d->u64 = (U64)peek_result;
+            }
+            else
+            {
+              got_debug = 0;
+            }
+          }
+        }
+      }
+      
+      result = got_debug;
+    }break;
+  }
+  return result;
+}
+
+internal B32
+dmn_lnx_thread_write_reg_block(DMN_LNX_Entity *thread, void *reg_block)
+{
+  B32 result = 0;
+  switch(thread->arch)
+  {
+    case Arch_Null:
+    case Arch_COUNT:{}break;
+    case Arch_x86:
+    case Arch_arm64:
+    case Arch_arm32:
+    {NotImplemented;}break;
     
-    //- rjf: read FPR
-    B32 got_fpr = 0;
-    if(got_gpr)
+    //- rjf: [x64]
+    case Arch_x64:
     {
-      Temp scratch = scratch_begin(0, 0);
-      DMN_LNX_XSave *xsave = 0;
-      DMN_LNX_XSaveLegacy *xsave_legacy = 0;
       
-      // rjf: try xsave
-      if(!xsave_legacy)
-      {
-        U8 xsave_buffer[KB(4)];
-        struct iovec iov_xsave = {0};
-        iov_xsave.iov_len = sizeof(xsave_buffer);
-        iov_xsave.iov_base = xsave_buffer;
-        if(ptrace(PTRACE_GETREGSET, tid, (void*)NT_X86_XSTATE, &iov_xsave) != -1)
-        {
-          xsave = push_array_no_zero(scratch.arena, DMN_LNX_XSave, 1);
-          MemoryCopy(xsave, xsave_buffer, sizeof(*xsave));
-          xsave_legacy = &xsave->legacy;
-        }
-      }
-      
-      // rjf: try fxsave
-      if(!xsave_legacy)
-      {
-        DMN_LNX_XSaveLegacy fxsave = {0};
-        struct iovec iov_fxsave = {0};
-        iov_fxsave.iov_len = sizeof(fxsave);
-        iov_fxsave.iov_base = &fxsave;
-        if(ptrace(PTRACE_GETREGSET, tid, (void *)NT_FPREGSET, &iov_fxsave) != -1)
-        {
-          xsave_legacy = push_array_no_zero(scratch.arena, DMN_LNX_XSaveLegacy, 1);
-          MemoryCopy(xsave_legacy, &fxsave, sizeof(*xsave_legacy));
-        }
-      }
-      
-      // rjf: fill from xsave legacy
-      if(xsave_legacy)
-      {
-        DMN_LNX_XSaveLegacy *src = xsave_legacy;
-        dst->fcw.u16 = src->fcw;
-        dst->fsw.u16 = src->fsw;
-        dst->ftw.u16 = src->ftw; // TODO(rjf): old: fix tag word (?)
-        dst->fop.u16 = src->fop;
-        dst->fip.u64 = src->b64.fip;
-        // TODO(rjf): these 16-bit registers do not belong in x64
-        dst->fcs.u16 = 0;
-        dst->fdp.u64 = src->b64.fdp;
-        dst->fds.u16 = 0;
-        dst->mxcsr.u32 = src->mxcsr;
-        dst->mxcsr_mask.u32 = src->mxcsr_mask;
-        {
-          U8 *float_s = src->st_space.u8;
-          REGS_Reg80 *float_d = &dst->st0;
-          for(U32 n = 0; n < 8; n += 1, float_s += 16, float_d += 1)
-          {
-            MemoryCopy(float_d, float_s, sizeof(*float_d));
-          }
-        }
-        {
-          U8 *xmm_s = src->xmm_space.u8;
-          REGS_Reg512 *xmm_d = &dst->zmm0;
-          for(U32 n = 0; n < 16; n += 1, xmm_s += 16, xmm_d += 1)
-          {
-            MemoryCopy(xmm_d, xmm_s, 16);
-          }
-        }
-      }
-      
-      // rjf: fill from ymm registers
-      // TODO(rjf): this is a lie; ymm can technically move around. study & fix.
-      if(xsave)
-      {
-        B32 has_ymm_registers = ((xsave->header.xstate_bv & 4) != 0);
-        if(has_ymm_registers)
-        {
-          U8 *ymm_s = (U8 *)xsave->ymmh;
-          REGS_Reg512 *ymm_d = &dst->zmm0;
-          for(U32 n = 0; n < 16; n += 1, ymm_s += 16, ymm_d += 1)
-          {
-            MemoryCopy(((U8*)ymm_d) + 16, ymm_s, 16);
-          }
-        }
-      }
-      
-      got_fpr = (xsave || xsave_legacy);
-      scratch_end(scratch);
-    }
-    
-    //- rjf: read debug registers
-    B32 got_debug = 0;
-    if(got_fpr)
-    {
-      got_debug = 1;
-      REGS_Reg64 *dr_d = &dst->dr0;
-      for(U32 i = 0; i < 8; i += 1, dr_d += 1)
-      {
-        if(i != 4 && i != 5)
-        {
-          U64 offset = OffsetOf(DMN_LNX_UserX64, u_debugreg[i]);
-          errno = 0;
-          int peek_result = ptrace(PTRACE_PEEKUSER, tid, PtrFromInt(offset), 0);
-          if(errno == 0)
-          {
-            dr_d->u64 = (U64)peek_result;
-          }
-          else
-          {
-            got_debug = 0;
-          }
-        }
-      }
-    }
-    
-    result = got_debug;
+    }break;
   }
   return result;
 }
@@ -1223,9 +1257,10 @@ dmn_ctrl_run(Arena *arena, DMN_CtrlCtx *ctx, DMN_RunCtrls *ctrls)
         
         // rjf: push event
         DMN_Event *e = dmn_event_list_push(arena, &evts);
-        e->kind    = e_kind;
-        e->process = dmn_lnx_handle_from_entity(process);
-        e->thread  = dmn_lnx_handle_from_entity(thread);
+        e->kind                = e_kind;
+        e->process             = dmn_lnx_handle_from_entity(process);
+        e->thread              = dmn_lnx_handle_from_entity(thread);
+        e->instruction_pointer = rip;
       }
       
       //- rjf: WSTOPSIG(status) is SIGSTOP
@@ -1473,7 +1508,13 @@ dmn_thread_read_reg_block(DMN_Handle handle, void *reg_block)
 internal B32
 dmn_thread_write_reg_block(DMN_Handle handle, void *reg_block)
 {
-  return 0;
+  B32 result = 0;
+  DMN_AccessScope
+  {
+    DMN_LNX_Entity *thread = dmn_lnx_entity_from_handle(handle);
+    result = dmn_lnx_thread_write_reg_block(thread, reg_block);
+  }
+  return result;
 }
 
 //- rjf: system process listing
diff --git a/src/demon/linux/demon_core_linux.h b/src/demon/linux/demon_core_linux.h
index a1433116..bfe31aef 100644
--- a/src/demon/linux/demon_core_linux.h
+++ b/src/demon/linux/demon_core_linux.h
@@ -331,5 +331,6 @@ internal DMN_Handle dmn_lnx_handle_from_entity(DMN_LNX_Entity *entity);
 internal DMN_LNX_Entity *dmn_lnx_entity_from_handle(DMN_Handle handle);
 internal DMN_LNX_Entity *dmn_lnx_thread_from_pid(pid_t pid);
 internal B32 dmn_lnx_thread_read_reg_block(DMN_LNX_Entity *thread, void *reg_block);
+internal B32 dmn_lnx_thread_write_reg_block(DMN_LNX_Entity *thread, void *reg_block);
 
 #endif // DEMON_CORE_LINUX_H
diff --git a/src/render/d3d11/render_d3d11.c b/src/render/d3d11/render_d3d11.c
index e14650c3..4a4e979c 100644
--- a/src/render/d3d11/render_d3d11.c
+++ b/src/render/d3d11/render_d3d11.c
@@ -548,6 +548,8 @@ r_window_equip(OS_Handle handle)
     r_d3d11_state->device->lpVtbl->CreateRenderTargetView(r_d3d11_state->device, (ID3D11Resource *)window->framebuffer, &framebuffer_rtv_desc, &window->framebuffer_rtv);
     
     result = r_d3d11_handle_from_window(window);
+    r_d3d11_state->window_count += 1;
+    r_d3d11_state->dxgi_device->lpVtbl->SetMaximumFrameLatency(r_d3d11_state->dxgi_device, Clamp(1, r_d3d11_state->window_count, 16));
   }
   ProfEnd();
   return result;
@@ -571,6 +573,8 @@ r_window_unequip(OS_Handle handle, R_Handle equip_handle)
     window->swapchain->lpVtbl->Release(window->swapchain);
     window->generation += 1;
     SLLStackPush(r_d3d11_state->first_free_window, window);
+    r_d3d11_state->window_count -= 1;
+    r_d3d11_state->dxgi_device->lpVtbl->SetMaximumFrameLatency(r_d3d11_state->dxgi_device, Clamp(1, r_d3d11_state->window_count, 16));
   }
   ProfEnd();
 }
diff --git a/src/render/d3d11/render_d3d11.h b/src/render/d3d11/render_d3d11.h
index 0344ff74..5ad8934b 100644
--- a/src/render/d3d11/render_d3d11.h
+++ b/src/render/d3d11/render_d3d11.h
@@ -129,6 +129,7 @@ struct R_D3D11_State
 {
   // rjf: state
   Arena *arena;
+  U64 window_count;
   R_D3D11_Window *first_free_window;
   R_D3D11_Tex2D *first_free_tex2d;
   R_D3D11_Buffer *first_free_buffer;