One product that can control Zoom Player remotely is NetRemote: http://www.promixis.com/products.php?section=netremote.
This uses buttons, icons, fields and panels on the Pocket PC or PC screen to control Zoom Player directory or to display the current state (position counters, OSD messages, current titles/chapters, position sliders etc). It talks directly to ZP via its comms interface - it does not need another program (e.g. Girder) in between.
NetRemote supports a range of plug-ins for different uses. The Zoom plug-in (to which I admit an interest, although I have nothing to do with Promixis) comes as standard out-of-the-box. When NetRemote is configured with the name of the player computer, and "Enable External TCP Control" is ticked in the ZP Interface options (with the default port), NetRemote can immediately control Zoom.
NetRemote currently comes in two versions. 1.1 is the latest release. But 2.0, although technically beta, has been around a few months and is quite stable. Both come with Zoom plug-in as standard.
The image attached gives one of the more boring screens for controlling your ZP. There are plenty of better designed alternatives around.
Give it a try
Brian