diff --git a/Cargo.toml b/Cargo.toml
index 575d071..d3abf75 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -40,4 +40,3 @@ client    = ["transport", "api", "dep:tokio", "dep:tokio-stream", "dep:uuid", "d
 server    = ["transport"]
 global    = ["client", "dep:lazy_static"]
 sync      = ["client"]
-backport = [] # TODO remove!
diff --git a/src/client.rs b/src/client.rs
index fbfaf51..41b5c66 100644
--- a/src/client.rs
+++ b/src/client.rs
@@ -2,6 +2,7 @@
 //!
 //! codemp client manager, containing grpc services
 
+use std::collections::BTreeMap;
 use std::sync::Arc;
 use tokio::sync::mpsc;
 use tonic::service::interceptor::InterceptedService;
@@ -25,7 +26,7 @@ use crate::workspace::Workspace;
 pub struct Client {
 	user_id: Uuid,
 	token_tx: Arc<tokio::sync::watch::Sender<Token>>,
-	workspace: Option<Workspace>,
+	pub workspaces: BTreeMap<String, Workspace>,
 	services: Arc<Services>
 }
 
@@ -83,7 +84,7 @@ impl Client {
 		Ok(Client {
 			user_id,
 			token_tx: Arc::new(token_tx),
-			workspace: None,
+			workspaces: BTreeMap::new(),
 			services: Arc::new(Services { workspace, buffer, cursor })
 		})
 	}
@@ -111,7 +112,7 @@ impl Client {
 			tracing::debug!("controller worker stopped");
 		});
 
-		self.workspace = Some(Workspace::new(
+		self.workspaces.insert(workspace_id.to_string(), Workspace::new(
 			workspace_id.to_string(),
 			self.user_id,
 			self.token_tx.clone(),
@@ -121,4 +122,8 @@ impl Client {
 
 		Ok(())
 	}
+
+	pub fn user_id(&self) -> Uuid {
+		self.user_id.clone()
+	}
 }
diff --git a/src/cursor/controller.rs b/src/cursor/controller.rs
index 3e793ac..af1f783 100644
--- a/src/cursor/controller.rs
+++ b/src/cursor/controller.rs
@@ -53,7 +53,7 @@ impl Controller<CursorEvent> for CursorController {
 	/// enqueue a cursor event to be broadcast to current workspace
 	/// will automatically invert cursor start/end if they are inverted
 	fn send(&self, mut cursor: CursorPosition) -> crate::Result<()> {
-		if cursor.start() > cursor.end() {
+		if cursor.start > cursor.end {
 			std::mem::swap(&mut cursor.start, &mut cursor.end);
 		}
 		Ok(self.op.send(CursorEvent {
diff --git a/src/cursor/mod.rs b/src/cursor/mod.rs
index 5b5f5ff..59d68f3 100644
--- a/src/cursor/mod.rs
+++ b/src/cursor/mod.rs
@@ -12,7 +12,7 @@ pub mod controller;
 
 pub use controller::CursorController as Controller;
 
-use crate::proto::cursor::{RowCol, CursorPosition};
+use crate::proto::cursor::RowCol;
 
 impl From::<RowCol> for (i32, i32) {
 	fn from(pos: RowCol) -> (i32, i32) {
@@ -26,25 +26,6 @@ impl From::<(i32, i32)> for RowCol {
 	}
 }
 
-impl RowCol {
-	/// create a RowCol and wrap into an Option, to help build protocol packets
-	pub fn wrap(row: i32, col: i32) -> Option<RowCol> {
-		Some(RowCol { row, col })
-	}
-}
-
-impl CursorPosition {
-	/// extract start position, defaulting to (0,0), to help build protocol packets
-	pub fn start(&self) -> RowCol {
-		self.start.clone()
-	}
-
-	/// extract end position, defaulting to (0,0), to help build protocol packets
-	pub fn end(&self) -> RowCol {
-		self.end.clone()
-	}
-}
-
 impl PartialOrd for RowCol {
 	fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
 		match self.row.partial_cmp(&other.row) {
diff --git a/src/lib.rs b/src/lib.rs
index 74373c1..c305f03 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -148,12 +148,11 @@ pub mod errors;
 #[cfg(feature = "client")]
 pub mod client;
 
+/// assorted helpers
 pub mod tools;
 
-/// client wrapper to handle memory persistence
-#[cfg(feature = "backport")]
-pub mod instance;
-
+/// workspace operations
+#[cfg(feature = "client")]
 pub mod workspace;
 
 /// all-in-one imports : `use codemp::prelude::*;`
@@ -176,13 +175,5 @@ pub mod proto {
 	pub mod workspace_service { tonic::include_proto!("workspace_service"); }
 }
 
-
 pub use errors::Error;
-pub use errors::Result;
-
-#[cfg(all(feature = "client", feature = "sync"))]
-pub use instance::sync::Instance;
-
-#[cfg(all(feature = "backport", not(feature = "sync")))]
-pub use instance::a_sync::Instance;
-
+pub use errors::Result;
\ No newline at end of file
diff --git a/src/prelude.rs b/src/prelude.rs
index 836ace7..3a2934b 100644
--- a/src/prelude.rs
+++ b/src/prelude.rs
@@ -20,16 +20,15 @@ pub use crate::api::{
 pub use crate::{
 	// Instance as CodempInstance,
 	client::Client as CodempClient,
+	workspace::Workspace as CodempWorkspace,
+	workspace::UserInfo as CodempUserInfo,
 	cursor::Controller as CodempCursorController,
-	// buffer::Controller as CodempBufferController,
+	buffer::Controller as CodempBufferController,
 };
 
-#[cfg(feature = "proto")]
+#[cfg(feature = "transport")]
 pub use crate::{
-	proto::CursorPosition as CodempCursorPosition,
-	proto::CursorEvent as CodempCursorEvent,
-	proto::RowCol as CodempRowCol,
-};
-
-#[cfg(feature = "global")]
-pub use crate::instance::global::INSTANCE as CODEMP_INSTANCE;
+	proto::cursor::CursorPosition as CodempCursorPosition,
+	proto::cursor::CursorEvent as CodempCursorEvent,
+	proto::cursor::RowCol as CodempRowCol,
+};
\ No newline at end of file