These abstractions are provided by netpd and are used for creating instruments. They make sure that the state of an instrument stays synchronized any time between peers. They convert control (and in some cases audio) data to outgoing OSC messages and also incoming OSC messages back to control (and audio) data.

[netpd_head $1 mysynth]
Every instrument requires exactly one [netpd_head]. It’s first argument must be $1 (this evaluates to the numeric ID given by unpatch) and the second argument sets the instrument name. This is the same name as the patch’s name without the .pd suffix.
[netpd_f $1 floatparam]
Every numeric control parameter of the instrument (slider, toggle, radio, numberbox [nbx]) uses a [netpd_f] in order to synchronize it between peers. It outputs the received value through the outlet and updates the state of the control object (slider, radio, toggle, or numberbox). The second argument specifies the parameter name, the optional third argument the initial default value. For the interaction with the GUI object to work, both, the send and receive symbol of the GUI object need to be set to $1-floatparam. Note: Do not use the classic numberbox with [netpd_f], since this one lacks feedback protection and cannot use the same symbol for send and receive.
[netpd_a $1 listparam]
Accepts messages of any type: float, symbol, list. However, it does not interact with any GUI objects directly.
[netpd_t $1 table]
Syncrhonizes a table. The table to be synchronized needs to be named $1-table and can be of any size between 2 and 2048. [netpd_t] detects any changes applied by messages, but also manual changes (when you draw into the table with your mouse).
[netpd_text $1 text]
Synchronizes a [text] object. You can use it almost like the original [text] object, but operations that modify the state happen asynchronously because they travel through network before application.
[netpd_sample $1 sample]
Synchronizes an audio sample. It can record audio through inlet or read audio from file or from another table. It can hold at most 1 min worth of audio data. Objects like [tabplay~], [tabread~], etc. can access the audio sample through the name $1-sample-table.
[netpd_s $1 sendname]
Raw netpd-ized send. Since it lacks any state management, it is useful only in special instances.
[netpd_r $1 receivename]
Raw netpd-ized receive. Since it lacks any state management, it is useful only in special instances.

Note: All above abstractions have their own help with more comprehensive documentation.