I'm new in Litestep. Great program!!!
Now. I downloaded the theme "REFLECTION_INVI" and I tried to install grdTransparent to add the effect of transparency, but it doesn't happen anything.
Down here there's a copy of "step.rc". PLEASE, COULD YOU TELL ME WHAT'S WRONG?


;------------------------------------------------------------------------------
; define critical folder locations
;------------------------------------------------------------------------------

PersonalDir "$LiteStepDir$personal\"
ThemesDir "$LiteStepDir$themes\"



;------------------------------------------------------------------------------
; load personal settings and theme
;------------------------------------------------------------------------------

include "$ThemesDir$themeselect.rc"
include "$ThemeDir$config\_compatibility_patch.rc"
LoadModule "$LiteStepDir$\modules\grdTransparent.dll"
*grdTransparent popup2 196 1
*grdTransparent task 64 1

IF ThemeIsOTS1Compliant
ShortcutsDir "$Desktop$"
ModulesDir "$ThemeDir$modules\"
include "$PersonalDir$personal.rc"
include "$ThemeDir$step.rc"

ELSE
ThemeIsOTS1Compliant false
ModulesDir "$LiteStepDir$modules\"
LoadModule "$LiteStepDir$NLM\NetLoadModule2.dll"
*NetLoadModuleSite "http://www.loose-screws.com/download.php?netloadmodule="
*NetLoadModuleSite "http://modules.shellfront.org/"
NetLoadModulePath "$ModulesDir$"
NetLoadModuleDocPath "$ModulesDir$docs\"
NetLoadModuleZipPath "$ModulesDir$archive\"
NetLoadModuleAliasFile "$LiteStepDir$NLM\NetLoadModule.ini"
include "$PersonalDir$personal.rc"
include "$ThemeDir$theme.rc"
ENDIF

You need to include those settings in the $ThemeDir$theme.rc file instead of the step.rc file. You also want to use the transparency that is native to xTaskbar and xPopup instead of loading grdTransparent.

And at what position do I have to put xTaskbar and xPopup?
And what do I have to write?

xTaskbar and xPopup should already be used in the theme. Read the docs found in your modules\docs folder on what is required for it to work.