You can control the size of a window with specifications that match the following format:
Mwm*sizeResource: value
For most applications, sizes are specified in pixels, although some applications use units that make sense for the application. For example, terminal windows are sized in characters and lines rather than in pixels.
The frameBorderWidth resource specifies the width of a
client window frame border with shadow elements, but without resize
handles. The default value, usually about 5 pixels, is based on the
size and resolution of the screen.
The limitResize resource controls the ability to
enlarge a window beyond the client's maximized size. The default value
of True limits a window's size to no greater than the
maximum size specified by the maximumClientSize resource,
or the default maximum size assigned by mwm. The value of
False allows a window to be resized to any size.
The maximumClientSize
resource controls the maximum size of a maximized client. The value
of this resource is specified either as width by height, interpreted
in terms of the units that the client uses, or with the values
vertical or horizontal, which causes the
Maximize operation to resize the window only in the
specified direction. If this resource is not specified, the size of
the screen is the default value.
The maximumMaximumSize
resource controls the maximum size of a client window as set by the
client. The dimensions are given in pixels. The default value of this
resource is twice the screen width and height.
The resizeBorderWidth
resource specifies the width of a client window frame border with
resize handles and shadow elements. The default value, usually about
10 pixels, is based on the size and resolution of the screen.
The resizeCursors resource
indicates whether the resize cursors are displayed when the pointer is
in the window resize border. The default value True
causes the appropriate resize cursor to appear when the pointer enters
a resize handle in the window frame. The value of False
prevents resize cursors from being displayed.