diff --git a/internal/client/client.go b/internal/client/client.go
index 174cf09..5f18cc0 100644
--- a/internal/client/client.go
+++ b/internal/client/client.go
@@ -9,6 +9,7 @@ _	"decl/internal/fan"
 _	"decl/internal/config"
 _	"decl/internal/resource"
 	"decl/internal/fs"
+	"decl/internal/builtin"
 _	"errors"
 	"fmt"
 	"context"
@@ -34,6 +35,16 @@ func NewClient() *App {
 	return a
 }
 
+// Load compiled-in config documents.
+func (a *App) BuiltInConfiguration() (err error) {
+	var defaultConfigurations []data.Document
+	if defaultConfigurations, err = builtin.BuiltInDocuments(); len(defaultConfigurations) > 0 {
+		slog.Info("Client.BuiltInConfiguration()", "documents", defaultConfigurations, "error", err)
+		a.Config.AppendConfigurations(defaultConfigurations)
+	}
+	return
+}
+
 // Load config documents from default system config path.  Ignore if missing.
 func (a *App) SystemConfiguration(configPath string) (err error) {
         var extractor data.Converter
@@ -48,6 +59,7 @@ func (a *App) SystemConfiguration(configPath string) (err error) {
 			u := folio.URI(fmt.Sprintf("file://%s", path))
 
 			if ! file.IsDir() {
+				slog.Info("Client.SystemConfiguration()", "uri", u)
 				if extractor, loadErr = folio.DocumentRegistry.ConverterTypes.New(string(u)); loadErr == nil {
 					if sourceResource, loadErr = u.NewResource(nil); loadErr == nil {
 						if loaded, loadErr = extractor.(data.ManyExtractor).ExtractMany(sourceResource, nil); loadErr == nil {
@@ -153,11 +165,14 @@ func (a *App) Apply(ctx context.Context, deleteResources bool) (err error) {
 		}
 		d.ResolveIds(ctx)
 
+		_ = d.Apply("stat")
+
 		if ! d.CheckConstraints() {
-			slog.Info("Client.Apply() document constrains failed", "requires", d)
+			slog.Info("Client.Apply() document constraints failed", "requires", d)
 			continue
 		}
 
+		slog.Info("Client.Apply()", "document", d, "state", overrideState, "error", err)
 		if e := d.(*folio.Document).Apply(overrideState); e != nil {
 			slog.Info("Client.Apply() error", "error", e)
 			return e
@@ -256,9 +271,12 @@ func (a *App) DiffCmd(docs []string) (err error) {
 	output := os.Stdout
 
 	var leftDocuments, rightDocuments []data.Document
+	var rightSource folio.URI
 
 	//leftSource := folio.URI(docs[0])
-	rightSource := folio.URI(docs[1])
+	if len(docs) > 1 {
+		rightSource = folio.URI(docs[1])
+	}
 
 	if leftDocuments, err = a.ImportSource(docs[0]); err == nil {
 		if rightSource.IsEmpty() {
@@ -266,13 +284,34 @@ func (a *App) DiffCmd(docs []string) (err error) {
 				_, err = doc.DiffState(output)
 			}
 		} else {
-			rightDocuments, err = a.ImportSource(docs[1])
-			err = a.Diff(leftDocuments, rightDocuments)
+			if rightDocuments, err = a.ImportSource(docs[1]); err == nil {
+				err = a.Diff(leftDocuments, rightDocuments)
+			}
 		}
 	}
         return err
 }
 
+func (a *App) ConfigCmd(docs []string, includeSystemConfig bool) (err error) {
+	if err = a.BuiltInConfiguration(); err != nil {
+		slog.Warn("BuiltInConfiguration()", "error", err)
+	}
+
+	if err = a.Import(docs); err != nil {
+		return
+	}
+
+	if err = a.LoadDocumentImports(); err != nil {
+		return
+	}
+
+	if includeSystemConfig {
+		_, err = a.emitter.Emit(a.Config, nil)
+	}
+	_, err = a.emitter.(data.ManyEmitter).EmitMany(a.Documents, nil)
+	return
+}
+
 func (a *App) Quiet() (err error) {
 	output := os.Stdout
 	for _, d := range a.Documents {
diff --git a/internal/client/client_test.go b/internal/client/client_test.go
index 884da13..88cf9f7 100644
--- a/internal/client/client_test.go
+++ b/internal/client/client_test.go
@@ -28,8 +28,7 @@ var ProcessTestGroupName string
 
 func TestMain(m *testing.M) {
 	LoggerConfig()
-	var err error
-	err = TempDir.Create()
+	err := TempDir.Create()
 	if err != nil || TempDir == "" {
 		log.Fatal(err)
 	}
@@ -161,12 +160,12 @@ func TestClientEmit(t *testing.T) {
 func BenchmarkClientSystemConfigurations(b *testing.B) {
 	assert.Nil(b, TempDir.Mkdir("benchconfig", 0700))
 	ConfDir := tempdir.Path(TempDir.FilePath("benchconfig"))
-	ConfDir.CreateFile("cfg.jx.yaml", `
+	assert.Nil(b, ConfDir.CreateFile("cfg.jx.yaml", `
 configurations:
 - name: files
   values:
     prefix: /usr
-`)
+`))
 	
 	configDirURI := fmt.Sprintf("file://%s", ConfDir)
 	
@@ -174,7 +173,7 @@ configurations:
 	b.Run("systemconfiguration", func(b *testing.B) {
 		for i := 0; i < b.N; i++ {
 			c := NewClient()
-			c.SystemConfiguration(configDirURI)
+			_ = c.SystemConfiguration(configDirURI)
 		}
 	})
 	programLevel.Set(slog.LevelDebug)
@@ -187,12 +186,12 @@ func TestClientSystemConfiguration(t *testing.T) {
 	assert.Nil(t, TempDir.Mkdir("config", 0700))
 
 	ConfDir := tempdir.Path(TempDir.FilePath("config"))
-	ConfDir.CreateFile("cfg.jx.yaml", `
+	assert.Nil(t, ConfDir.CreateFile("cfg.jx.yaml", `
 configurations:
 - name: files
   values:
     prefix: /usr
-`)
+`))
 	
 	//configDirURI := fmt.Sprintf("file://%s", ConfDir)
 	configErr := c.SystemConfiguration(string(ConfDir))
@@ -207,5 +206,40 @@ configurations:
 	value, valueErr := cfg.GetValue("prefix")
 	assert.Nil(t, valueErr)
 	assert.Equal(t, "/usr", value.(string))
-	return
+}
+
+func TestClientApply(t *testing.T) {
+	ctx := context.Background()
+	c := NewClient()
+	assert.NotNil(t, c)
+
+	assert.Nil(t, TempDir.Mkdir("apply", 0700))
+	ApplyDir := tempdir.Path(TempDir.FilePath("apply"))
+
+	DocSource := ApplyDir.FilePath("res.jx.yaml")
+	TestFile := ApplyDir.FilePath("testfile.txt")
+	assert.Nil(t, ApplyDir.CreateFile("res.jx.yaml", fmt.Sprintf(`
+resources:
+- type: file
+  transition: create
+  attributes:
+    path: %s
+    content: |
+      a test string
+    owner: %s
+    group: %s
+    mode: 0644
+`, TestFile, ProcessTestUserName, ProcessTestGroupName)))
+
+
+	assert.Nil(t, c.Import([]string{DocSource}))
+	assert.Nil(t, c.LoadDocumentImports())
+
+	assert.Nil(t, c.Apply(ctx, false))
+
+	assert.FileExists(t, TestFile)
+
+	assert.Nil(t, c.Apply(ctx, true))
+
+	assert.NoFileExists(t, TestFile)
 }