diff --git a/src/data.rs b/src/data.rs
index 1366279..d116dbd 100644
--- a/src/data.rs
+++ b/src/data.rs
@@ -110,6 +110,195 @@ pub enum Operation {
         detach: bool,
     },
 
+    /// Sends additional data to stdin of running process
+    ProcStdin {
+        /// Id of the actively-running process to send stdin data
+        id: usize,
+
+        /// Data to send to stdin of process
+        data: Vec<u8>,
+    },
+
     /// Retrieve a list of all processes being managed by the remote server
     ProcList {},
 }
+
+/// Represents an response to an operation performed on the remote machine
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(
+    rename_all = "snake_case",
+    deny_unknown_fields,
+    tag = "status",
+    content = "payload"
+)]
+pub enum Response {
+    /// Represents a successfully-handled operation
+    Ok(ResponsePayload),
+
+    /// Represents an operation that failed
+    Error {
+        /// The message associated with the failure
+        msg: String,
+    },
+}
+
+/// Represents the payload of a successful response
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(
+    rename_all = "snake_case",
+    deny_unknown_fields,
+    tag = "type",
+    content = "data"
+)]
+pub enum ResponsePayload {
+    /// Response to reading a file
+    FileRead {
+        /// The path to the file on the remote machine
+        path: PathBuf,
+
+        /// Contents of the file
+        data: Vec<u8>,
+    },
+
+    /// Response to writing a file
+    FileWrite {
+        /// The path to the file on the remote machine
+        path: PathBuf,
+
+        /// Total bytes written
+        bytes_written: usize,
+    },
+
+    /// Response to appending to a file
+    FileAppend {
+        /// The path to the file on the remote machine
+        path: PathBuf,
+
+        /// Total bytes written
+        bytes_written: usize,
+    },
+
+    /// Response to reading a directory
+    DirRead {
+        /// The path to the directory on the remote machine
+        path: PathBuf,
+
+        /// Entries contained within directory
+        entries: Vec<DirEntry>,
+    },
+
+    /// Response to creating a directory
+    DirCreate {
+        /// The path to the directory on the remote machine
+        path: PathBuf,
+    },
+
+    /// Response to removing a directory
+    DirRemove {
+        /// The path to the directory on the remote machine
+        path: PathBuf,
+
+        /// Total files & directories removed within the directory (0 if directory was empty)
+        total_removed: usize,
+    },
+
+    /// Response to copying a file/directory
+    Copy {
+        /// The path to the file/directory on the remote machine
+        src: PathBuf,
+
+        /// New location on the remote machine for copy of file/directory
+        dst: PathBuf,
+    },
+
+    /// Response to moving/renaming a file/directory
+    Rename {
+        /// The path to the file/directory on the remote machine
+        src: PathBuf,
+
+        /// New location on the remote machine for the file/directory
+        dst: PathBuf,
+    },
+
+    /// Response to starting a new process
+    ProcStart {
+        /// Arbitrary id associated with running process
+        id: usize,
+    },
+
+    /// Actively-transmitted stdout as part of running process
+    ProcStdout {
+        /// Arbitrary id associated with running process
+        id: usize,
+
+        /// Data sent to stdout by process
+        data: Vec<u8>,
+    },
+
+    /// Actively-transmitted stderr as part of running process
+    ProcStderr {
+        /// Arbitrary id associated with running process
+        id: usize,
+
+        /// Data sent to stderr by process
+        data: Vec<u8>,
+    },
+
+    /// Response to a process finishing
+    ProcDone {
+        /// Arbitrary id associated with running process
+        id: usize,
+
+        /// Whether or not termination was successful
+        success: bool,
+
+        /// Exit code associated with termination, will be missing if terminated by signal
+        code: Option<i32>,
+    },
+
+    /// Response to retrieving a list of managed processes
+    ProcList {
+        /// List of managed processes
+        entries: Vec<RunningProcess>,
+    },
+}
+
+/// Represents information about a single entry within a directory
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "snake_case", deny_unknown_fields)]
+pub struct DirEntry {
+    /// Represents the full path to the entry
+    pub path: PathBuf,
+
+    /// Represents the type of the entry as a file/dir/symlink
+    pub file_type: FileType,
+
+    /// Depth at which this entry was created relative to the root (0 being immediately within
+    /// root)
+    pub depth: usize,
+}
+
+/// Represents the type associated with a dir entry
+#[derive(Copy, Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "snake_case", deny_unknown_fields, untagged)]
+pub enum FileType {
+    Dir,
+    File,
+    SymLink,
+}
+
+/// Represents information about a running process
+#[derive(Clone, Debug, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "snake_case", deny_unknown_fields)]
+pub struct RunningProcess {
+    /// Name of the command being run
+    pub cmd: String,
+
+    /// Arguments for the command
+    pub args: Vec<String>,
+
+    /// Arbitrary id associated with running process
+    ///
+    /// Not the same as the process' pid!
+    pub id: usize,
+}