Backspace is

`Delete`

All hotkeys for Houdini (Windows)

Main Menu New pane tab	`Ctrl` + `T`
Main Menu Tear off pane tab	`Alt` + `Shift` + `C`
Main Menu Next pan tab	`Ctrl` + `Page down`
Main Menu Previous pane tab	`Ctrl` + `Page up`
Main Menu Close pane tab	`Ctrl` + `W`
Main Menu Close all pane tab	`Alt` + `/`
Main Menu Network control	`Alt` + `\`
Main Menu Move playbar here	`Alt` + `P`
Main Menu Maximize pane	`Ctlr` + `B`
Main Menu Split pane left/right	`Alt` + `[`
Main Menu Split pan top/botton	`Alt` + `]`
Main Menu Select viewport	`Ctrl` + `N`
Main Menu Edit path as text	`Ctrl` + `I`
Main Menu Scene view	`Alt` + `1`
Main Menu Network view	`Alt` + `2`
Main Menu Parameters	`Alt` + `3`
Main Menu Tree view	`Alt` + `4`
Main Menu Textport	`Alt` + `5`
Main Menu Channel editor	`Alt` + `6`
Main Menu Material palette	`Alt` + `7`
Main Menu Details view	`Alt` + `8`
Main Menu Context view	`Alt` + `9`
Main Menu Play forward	`Up arrow`
Main Menu Play back	`Down arrow`
Main Menu Next frame	`Right arrow`
Main Menu Previous frame	`Left arrow`
Main Menu First frame	`Ctrl` + `Up arrow`
Main Menu Next scoped frame	`Ctrl` + `Right` arrow
Main Menu Previous scoped frame	`Ctrl` + `Left arrow`
Particle/Contex/Scene View Select	`S`
Particle/Contex/Scene View Move	`T`
Particle/Contex/Scene View Rotate	`R`
Particle/Contex/Scene View Scale	`E`
Particle/Contex/Scene View Handle	`Enter`
Particle/Contex/Scene View View	`Esc`
Particle/Contex/Scene View Tool menu	`Tab`
Particle/Contex/Scene View Repeat last tool	`Q`
Particle/Contex/Scene View Objects	`1`
Particle/Contex/Scene View Points	`2`
Particle/Contex/Scene View Edges	`3`
Particle/Contex/Scene View Primitives (faces)	`4`
Particle/Contex/Scene View Vertices	`5`
Particle/Contex/Scene View Particles	`6`
Particle/Contex/Scene View Dynamics	`7`
Particle/Contex/Scene View Toggle object/geometry	`F8`
Particle/Contex/Scene View Toggle wireframe/shaded	`W`
Particle/Contex/Scene View Dispay options	`D`
Particle/Contex/Scene View Restore camera view	`[`
Particle/Contex/Scene View Orthographic/ perspective	`O`
Particle/Contex/Scene View Select	`N`
Particle/Contex/Scene View Select all	`Ctrl` + `A`
Particle/Contex/Scene View Invert selection	`Ctrl` + `I`
Particle/Contex/Scene View Tumble	`Left mouse button`
Particle/Contex/Scene View Dolly	`Right mouse button`
Particle/Contex/Scene View Pan	`Middle mouse button`
Particle/Contex/Scene View Home grid	`H`
Particle/Contex/Scene View Home all	`A`
Particle/Contex/Scene View Home selected	`Shift` + `G`
Particle/Contex/Scene View Frame grid	`F`
Particle/Contex/Scene View Frame all	`Shift` + `A`
Particle/Contex/Scene View Frame selected	`Shift` + `F`
Particle/Contex/Scene View Expand viewport	`B`
Particle/Contex/Scene View Perspective view	`1`
Particle/Contex/Scene View Top view	`2`
Particle/Contex/Scene View Front view	`3`
Particle/Contex/Scene View Right view	`4`
Particle/Contex/Scene View UV view	`5`
Particle/Contex/Scene View Single view	`Ctrl` + `1`
Particle/Contex/Scene View Four view	`Ctrl` + `2`
Particle/Contex/Scene View Two views stacked	`Ctrl` + `3`
Particle/Contex/Scene View Two views side by side	`Ctrl` + `4`
Particle/Contex/Scene View Three views split bottom	`Ctrl` + `5`
Particle/Contex/Scene View Three views split left	`Ctrl` + `6`
Particle/Contex/Scene View Four views split bottom	`Ctrl` + `7`
Particle/Contex/Scene View Four view split left	`Ctrl` + `8`
Particle/Contex/Scene View Grid	`X`
Particle/Contex/Scene View Primitive(Curve)	`C`
Particle/Contex/Scene View Point	`V`
Particle/Contex/Scene View Multi-snapping	`Ctrl` + `J`
Network View Tool menu	`Tab`
Network View Next pane	`Alt` + `Left arrow`
Network View Previous pane	`Alt` + `Right arrow`
Network View Select all	`A`
Network View Turn on bypass flag	`B` + `Cursor sensitive`
Network View Color palette	`C`
Network View Display options	`D`
Network View Drop on wire	`E`
Network View Focus - pans and zooms	`F`
Network View Focus/home in large	`G`
Network View Focus - pans and centers	`H`
Network View Dive into network	`I` & `Enter`
Network View Set key frame at obj level	`K`
Network View Layout and center	`L`
Network View Toggle names	`N`
Network View Overview window	`O`
Network View Mini parameter editor	`P`
Network View Repeat last tool	`Q`
Network View Reorder inputs	`R`
Network View Toggle splines	`S`
Network View Tree list view	`T`
Network View Jump up out of network	`U`
Network View Scope channel	`V`
Network View Outliner view	`W`
Network View Group menu	`X`
Network View Previous zoom level	`Z`
Parameters Set keyframe	`K`
Parameters Toggle autokey	`Alt` + `K`
Parameters Key handle	`Ctrl` + `K`
Parameters Key translate	`Shift` + `T`
Parameters Key rotate	`Shift` + `R`
Parameters Key scale	`Shift` + `E`
Parameters Revert to previous value	`Shift` + `Right mouse button`
Parameters Scope appended parameter	`Shift` + `Left mouse button`
Parameters Scope parameter	`Shift` + `RIght mouse button`
Parameters Set key frame	`Alt` + `Left mouse button`
Parameters Remove key frame	`Crtl` + `Left mouse button`
Parameters Edit expression	`Alt` + `E`
Parameters Delete channel	`Ctrl` + `Shift` + `Left mouse button`
Parameters Read expression	`Right mouse button` + `Label`
Parameters Read expression	`Middle mouse button` + `Label`
Parameters Export parameter to type prorperties	`Alt` + `Middle mouse button`
Common List Controls Move up list	`Up arrow`
Common List Controls Move down list	`Down arrow`
Common List Controls Expand	`Left arrow`
Common List Controls Collapse	`Rigth arrow`
Common List Controls Page up	`Page up` & `Ctrl` + `B`
Common List Controls Page down	`Page down` & `Ctrl` + `F`
Common List Controls Sort ascending	`Shift` + `A`
Common List Controls Sort Descending	`Shift` + `D`
Common List Controls Sort nothing	`Shift` + `N`
Common List Controls Edit name	`Enter`
Common List Controls Delete	`Delete`
Tree View Edit Network	`I` & `Enter`
Tree View Toggle display	`1`
Tree View Previous error node	`Shift` + `E`
Tree View Next error node	`E`
Take list Append take	`Shift` + `T`
Take list Insert take	`Insert`
Take list Copy take	`Alt` + `C` / `Ctrl` + `C`
Take list Show take controls	`W`
Light Linker Open spreadsheet	`W`
Material Palette Delete entry	`Delete`
Material Palette Duplicate entry	`D`
Material Palette Edit	`Enter`
Parameter Spreadsheet Full node path	`N`
Parameter Spreadsheet Select none	`C`
Parameter Spreadsheet Open parameter tree	`W`
Textport External editor	`Alt` + `E`
Channel Editor Import into Displayed parameters	`>`
Channel Editor Export into Displayed parameters	`<`
Channel Editor Isolate channels	`I`
Channel Editor Include channels	`Shift` + `I`
Channel Editor Cut	`Alt` + `X`
Channel Editor Copy	`Alt` + `C`
Channel Editor Paste	`Alt` + `V`
Channel Editor Delete	`Delete`
Channel Editor Tie/Untie	`T`
Channel Editor Set selection to default values	`B`
Channel Editor Set selected slopes to zero	`0`
Channel Editor Smooth selected slopes	`9`
Channel Editor Home channels (Current graph)	`G`
Channel Editor Home channels	`H`
Channel Editor Home play back range	`J`
Channel Editor Home global range	`Shift` + `J`
Channel Editor Frame selction	`F`
Channel Editor Vertical adapt	`V`
Channel Editor Show scale handle	`Y`
Channel Editor Show full channel names	`N`
Channel Editor Show channel names	`Shift` + `N`
Channel Editor Show group list	`X`
Channel Editor Show channel lister	`Tab` / `Backspace`
OSX Differences Delete is	`Backspace`
OSX Differences Backspace is	`Delete`
OSX Differences Combo	`Command`
OSX Differences Combo	`Function`
Render Scheduler Suspend all jobs	`S`
Render Scheduler Restart all jobs	`R`
Render Scheduler Kill all jobs	`Shift` + `K`
Render Scheduler Clear completed jobs	`C`
Composite View Snap option	`Ctrl` + `Shift` + `J`
Shader View Object	`M`
Shader View Resolution	`L`
Shader View Transparency	`A`
Shader View Home	`H`
Render View Cancel render	`Esc`
Render View Display options	`D`
Render View Inspector	`I`
Render View Home/Focus	`G` & `H`
Render View Detail view	`M`
Render View Repeat zoom	`/` / `Shift` + `/`
Render View Zoom in	`+`
Render View Zoom out	`-`
Render View RGBA	`'`
Render View Red	`1`
Render View Green	`2`
Render View Blue	`3`
Render View Alpha	`4`
Bundle List New bundle	`Shift` + `B`
Bundle List Duplicate bundle	`Shift` + `D`
Bundle List Delete bundle	`Delete`
Bundle List Show full path for bundle nodes	`F`
Detais View Jump up	`U`
Detais View Jump down	`I` & `Enter`
Detais View Set current above	`Page up`
Detais View Set current below	`Page down`
Detais View Set current left	`Shift` + `Page up`
Detais View Set current right	`Shift` + `Page down`